Climbing Finger Board
Climbers need tremendous grip strength especially in their fingertips to grab and hold very small rock holds. Fingerboards can strengthen and condition fingertips but buying a commercial one seemed unnecessarily expensive, so I made one at home out of many 2X4s that I glued and screwed together.
I cut out the 2x4s and glued them together. Then using a spade bit I cut out the holds. Then I mixed grip sand for porches in with regular paint to create a rough texture and painted the fingerboard.