Jonathan Siegrist provides some helpful pointers to building strength without strain on the campus board. Check out more in depth campus board lessons along with a plethora of other tips and tricks for finger strength in his online educational course 6 Weeks to Stronger Fingers. Crafted by Siegrist, this comprehensive training plan is aimed at 5.11–5.13 climbers. If you want holds to feel bigger or want to climb longer and harder, this online course is for you. Price: $45.