Understand campusing in bouldering: what it asks of your fingers, which prerequisites you need and why the build-up runs through legs and feet.
Campusing means: you climb with your arms only, without foot contact, often dynamically from hold to hold. In biomechanics this counts among the special cases with only one or no wall contact; the legs only provide momentum and stabilize [1]. The honest answer to "Isn't that just strength training for the fingers?": it is the hardest way to load the fingers, and at the same time the one where a build-up mistake is the most expensive.
The numbers behind it: in a study of eleven elite climbers, the loading rate of the fingers was highest in campusing and lowest in the crimp. In 59–73% of the holding phases there were eccentric finger joint movements across all grip types, on average −6.0° in the middle joint in campusing [2]. Eccentric means: the finger is stretched under load instead of flexing. That is regarded as a risk factor for pulley tears [2]. Whether the differences relate to an individual's injury risk is open according to the authors.
This guide therefore describes no campus board routine with hold depth, sets and repetitions. It explains what campusing demands, when you are ready and why the way leads through legs and feet. Count in months to years (an experience value, not a measurement).
Entry criteria (practice standard):
Go through the entry criteria one by one. If one is missing, campusing is not your next step.
Milestone: You can back up each prerequisite with a date and experience.
First practise deadpoint and other dynamic moves with foot contact. The legs initiate the movement, the arms catch [1]. This is the basis for every campus variant.
Milestone: You catch dynamic moves cleanly without the holds snapping away under you.
Use big, simple ledges and keep the feet on the ground. The hands practise the movement, the legs take most of the load.
Milestone: You move calmly across several ledges without finger or elbow pain.
Only now do you take the feet away, and only for short sequences on big ledges. Less is more here: stop before technique suffers. Finger flexion changes with the grip [3]; aim for an open grip rather than a hard crimp.
Milestone: You manage a short sequence under control and without pain, even one to two days later.
Campusing is not a must. There are alternatives: in a preliminary study of 18 boulderers, a plyometric program improved pull-up performance but not clearly finger strength [6]. Decide by goal, not by fashion. Whoever needs dynamic moves for competition boulders also trains them with feet, on big holds and with clean technique, without a campus board (practical experience, not a measurement).
Milestone: You can explain why campusing is in your plan, or why it is not.
Campusing loads the finger tendons and pulleys: pulley injuries are the most common overuse injury in climbing, and A2, A3 and A4 are particularly at risk, above all under eccentric loading [4]. A study of eleven elite climbers found the highest loading rate in campusing [2]. I did not find a study that counts injuries per campus session. Build-up instead of shortcuts: this guide deliberately contains no campus board routine. Have a coach show you ledge choice, volume and rest, stop at pain in the finger or elbow and have persistent complaints checked by a doctor. This does not replace supervised training or medical advice.
Do the two-day check: feel into your fingers the day after and two days later. If pulleys or middle joints still throb at night, it was too much. This is practical experience and not proven, but the measurements show that the loading rate of the fingers was highest in campusing [2].
Campusing means climbing from hold to hold with the arms only, without foot contact, often dynamically. Biomechanically it is a special case with only one or no wall contact; the legs only provide momentum and stabilize [1].
It loads the fingers heavily: in a study of eleven elite climbers the loading rate was highest in campusing [2], and pulley injuries are the most common overuse injury [4]. There are no figures per campus session.
When you have been pain-free for months, climb dynamic moves under control and have a coach who accompanies you. Training should be limited for lower-graded climbers [5].
No. There are alternatives: in a preliminary study of 18 boulderers, a plyometric program improved pull-up performance but not clearly finger strength [6]. Decide by goal and injury history.
Coordination Move: Timing Across Several Phases