First Time on a Route: Onsight or Flash, How Long to Read It, When to Commit

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You're standing under a 5.10d you've never climbed. The person next to you looked at it for thirty seconds and set off. You want to look longer, but you worry about holding everyone up. Up on the wall, just before the third quickdraw, you find your hands are the wrong way round. You swap hands twice and you're pumped out by half height.

This is post 4 of the Climbing Mental Game and Tactics series, and the point where it moves from mindset to tactics. The onsight is where managing anxiety, reading the route and committing all happen at once. For definitions of onsight, flash and redpoint and how grades are recorded, see grades and protection ratings. The basics of route reading (what to look at, miming the moves, resting and shaking out on the wall) are in resting, route reading and setting your own beta. This post adds three things: what research says about onsight and flash, levels of route reading and how to practise them, and when to commit.

First choose: onsight or flash

If your goal is to send this route today, the most effective move is to watch someone climb it first. In Spain, Morenas et al. (2021) had 21 climbers who climb 7b–7c+ try 18 short 6c boulder problems (6 holds each), well below their level, under three conditions (research):

Both live and video clearly beat watching nothing. Live scored higher, but the difference between live and video was not statistically significant. The authors' explanation: watching someone climb shows you how a hold can be used, which you can't see from the wall alone. In the Netherlands, Boschker and Bakker (2002) saw something similar (research): inexperienced climbers who watched a video of an expert then used the moves from the video and climbed faster and more fluently.

But a flash has a cost: you skip one round of route-reading practice. In UKClimbing's ten tips to improve your onsight grade, Natalie Berry's first tip is "look at the route, less YouTube" (coaching consensus). Resist checking the beta, work the moves out yourself, and you may find a sequence that suits you better than the video's. If your onsighting is stuck, switch to practising flashes first: ask a friend to climb the route and talk you through it, then see how much you remember once you're on the wall.

Try this next session: split the new routes you plan to climb into two groups. For one group you only practise the onsight: don't watch anyone, read it yourself. For the other, watch someone first, then note where what you copied differed from what you'd have done.

How long to read: let the grade decide

Not every route needs reading; the harder the route, the more time it deserves. Coach Neil Gresham, in his Climbing magazine article on onsighting, splits route reading into four levels (coaching consensus):

Gresham also warns that level 3 isn't recommended for climbers at lower grades, because it can create confusion.

A few more specific tips:

• Look from below and from the side. From below you see undercuts; from the side you see side-pulls. Many people only read the first half, but the top half is where you'll be pumped and most likely to fall.
• Plan hands exactly; don't lock in the feet. Note the key footholds only and decide the rest as you climb. Over-planning your feet causes confusion.
• Pick your clipping holds. The best clipping hold is usually level with the quickdraw, or one hold above it, but in the end it comes down to which hold is biggest.
• Check your answers afterwards. See which moves you read correctly, and you'll read more accurately next time.

Try this next session: work out your current onsight grade. Next time you're under a new route at that grade, read it at level 2: hand sequence, rests, clipping holds. Go through it twice before you tie in.

Looking longer doesn't mean climbing smoother

Reading the route helps, but more isn't always better. In France, Seifert et al. (2017) used eye tracking to record how 18 climbers previewed a 10 m, 5b top-rope route, then analysed their movement on the wall. The more times a climber scanned the whole route beforehand, the larger the share of time they later spent exploring holds and the smaller the share spent actually changing holds (research). This is a correlation and doesn't prove that over-reading makes you hesitant, but it's a reminder that more looking doesn't guarantee smoother climbing.

Resting, route reading and setting your own beta covered a 2012 study by Sanchez and colleagues: a 3-minute preview meant fewer stops, but no change in send rate. Put the two studies together and the more reasonable conclusion is that the quality of your reading matters more than the time you spend.

What does quality look like? Boschker et al. (2002) had experts, novices and non-climbers look at a wall, then place its 23 holds back on a scale model. Experts recalled more holds, in clusters, and remembered what each hold could be used for. Non-climbers remembered what the holds looked like (research).

Whitaker et al. (2020) also found that skilled climbers were less confident when judging whether they could do a move, but judged more accurately. Less skilled climbers were more confident and less accurate (research).

Try this next session: when you read a route, don't memorise "big blue hold, small yellow hold". Split the route into three to five sections and describe each one as movement, e.g. "right-hand side-pull, high left foot, stand up and clip the third draw". After climbing, compare with your description and see which section you got wrong.

Practising route reading: route maps and warm-ups

Route reading can become a habit. Two ways to train it (Berry; coaching consensus):

• Draw a route map. Sketch the rough shape of the holds on paper and mark the sequence with arrows. It's tedious, but it forces you to actually think, until it becomes intuitive.
• Treat warm-ups as practice. Many people climb warm-ups on autopilot and miss the best chance to practise reading. Guess a sequence before you climb, review what felt awkward afterwards, and retry those moves on the way down.

Plan your clips from the ground too. Overreaching, clipping with a bent arm and clipping from poor holds are the least efficient; a spot where you can clip two draws at once is even better (Berry).

Try this next session: this week, pick one warm-up route each session. Before climbing, write the hand sequence and clipping holds on your phone as text or a quick sketch. Afterwards, tick or cross each one. In two weeks, check whether your hit rate has gone up.

On the wall: read three moves ahead and find your pace

Reading on the wall is like driving (Berry; coaching consensus): keep looking ahead for the hazards (the crux), the red lights (rests), and which lane you need for the next turn (which hand takes the next hold). So read at least three moves ahead.

Adjust your pace as well: quicker on steep, hard ground; slower on gentler ground where you can comfortably read ahead. British onsight specialist Steve McClure, quoted in the same article, says something worth taping to the wall:

"Most climbers fall into the trap of stopping when they need to get going, and going when they need to stop. That is, they move past all the rest areas straight into the crux where they immediately stall, hang around wondering what to do and then eventually fall off."

His advice: find the hard sections from the ground; take every rest, even when you don't feel tired, to relax and look up; at the crux, attack it forcefully.

Try this next session: mark every possible rest on the route you're reading. On the wall, stop at each rest for three seconds and look three moves up before setting off.

When to commit

Berry says the biggest hurdle in onsighting is the unknown, and the unknown all too often makes climbers indecisive. Climbers who go up and down in front of the crux trying different sequences often end up pumped and off, thinking "I should have stuck with the first one". The fix: work out two or three sequences for the crux from the ground, try the most likely one first, and switch to plan B only if it really doesn't work.

In the same article, two top climbers, one British and one Swedish, give very similar advice:

• James McHaffie: decide your sequence before the crux, then tell yourself that once you're committed you move fast and keep going until you reach gear or a shakeout.
• Matilda Söderlund: don't hesitate once you're on the wall. Taking a chance is better than wasting energy on hesitation.

This is the experience of coaches and top climbers, with no controlled study behind it. But it fits the direction of the research in the series overview: anxiety makes you stop on holds and keep exploring, and the longer you stop, the more energy you burn.

Committing also needs your body to be ready (coaching consensus). In another article, Gresham notes that many people try to save energy for their target route, climb one very easy warm-up and go straight on, then get flash pump that no amount of shaking out will flush. He suggests first climbing a mid-grade route that gets you 60–80% pumped, then trying your limit onsight.

Try this next session: before your next limit onsight, climb a mid-grade route that gets your forearms a little pumped, and rest until your breathing settles. On the ground, prepare plan A and plan B for the crux, and start with A.

Why the onsight is so scary

Routes above your onsight grade are the scariest. Giles et al. (2026) had 61 intermediate to advanced climbers each onsight one lead route. The group on routes above their level had clearly higher somatic and cognitive anxiety, lower self-confidence and less fluent movement (research). Berry's tenth tip makes a related point: if you're unsure about falling, the fear is heightened on a limit onsight because you don't know how you'll fall.

Two pieces of advice you can use straight away:

• For the fear of falling, go back to post 1's fall practice and practise falls on a route of similar angle first.
• For the fear of failing, there's a simple trick (Berry): if you don't want the pressure, don't announce "I'm going for the onsight" to your belayer. Just climb.

Try this next session: next time you want to onsight a route near your limit, take two practice falls on a known route of similar angle on the same wall first, then go for it.

Practice: four scenarios

1. You want to send a boulder problem you've never tried, today, and a friend is about to climb it.

2. You've spent five minutes in front of a warm-up route planning every foot move.

3. In front of the crux you try it left-handed, reverse, try it right-handed, go back and forth three times, and pump out.

4. To save energy you warm up on a single 5.8, then go for an onsight of your limit 5.11a. By the second quickdraw your forearms are gone.

Next

If the onsight doesn't go, the route becomes your project. Post 5: redpoint and projecting covers how to pick a project, how many attempts to make in a day, how long to rest between them, and when to move on.

References

• Morenas J, et al. Influence of On-Sight and Flash Climbing Styles on Advanced Climbers' Route Completion for Bouldering (IJERPH, 2021)
• Boschker MS, Bakker FC. Inexperienced sport climbers might perceive and utilize new opportunities for action by merely observing a model (Percept Mot Skills, 2002)
• Boschker MS, Bakker FC, Michaels CF. Memory for the functional characteristics of climbing walls: perceiving affordances (J Mot Behav, 2002)
• Seifert L, et al. Role of route previewing strategies on climbing fluency and exploratory movements (PLoS One, 2017)
• Whitaker MM, et al. Expertise effects on the perceptual and cognitive tasks of indoor rock climbing (Mem Cognit, 2020)
• Giles D, Mangan K, Draper N. Climber Ability and Differences in Psychological, Physiological and Behavioral Responses to an On-sight Lead Climb (Span J Psychol, 2026)
• Neil Gresham: Increase Your Onsight Grade By Reading Routes From the Ground (Climbing, 2022-02-28)
• Neil Gresham: Improve Two Grades Instantly With Coach's Magic-Bullet Advice. Six Tips That Actually Work. (Climbing, 2023-08-17)
• Natalie Berry: The Unknown: Top Ten Tips to Improve your Onsight Grade (UKClimbing)
• Grades and protection ratings
• Resting, route reading and setting your own beta