Using a hangboard to "crawl" fingers between holds can build functional strength specifically for the wall.
In crack climbing, tucking the thumb into the palm can expand the hand’s width to secure a "jam" in cracks between 1.5 to 2.5 inches.
Expert climbers use their thumb as a secondary point of contact on nearby crystals or bumps to maintain balance while shifting weight. 2. Training for "Mature" Finger Strength free solo mature thumbs
For veteran climbers, the thumb acts as a "secret weapon" to provide stability on minuscule holds where a standard grip isn't possible. 1. Thumb & Hand Techniques for Experienced Soloists
"Mature" free soloists typically prioritize mental mastery over raw risk-taking: Using a hangboard to "crawl" fingers between holds
Advanced climbing often relies on maximizing contact with the rock through specific thumb engagements:
A popular "6-minute protocol" involves 30 seconds of finger rolls and extensions followed by 10-second hangs on large holds to load connective tissues without causing fatigue. Thumb & Hand Techniques for Experienced Soloists "Mature"
Engaging large muscle fibers by gripping as hard as possible for 3–5 seconds after a slow 1–2 second build-up of force. 3. The Psychology of Experience