Never does nature say one thing and wisdom another. -Juvenal
Grip training/ Core conditioning
Find a "bipod swingset" at a playground, the taller, the better. They have only 2 supports in the ground that meet at the top- Image.
Sit on the ground and climb up one side of the support poles, once at the top, reach for the other, climb back down the other side. Reverse the process and you've done 1 repetition.
Do 10 repetitions, resting as needed.
Do 3 sets of 5 repetitions, resting only after all 5 are complete (don't touch the ground half way through a rep)
Do 2 sets of 10 repetitions, touching the ground to rest only between sets.