Why do my wrists hurt in Planks and L-Sit Preps?
Most training programs don't have exercises that teach you how to use your lats as stabilizers in pushing movements. That's why most of us have weak lats.
Most training programs don't have exercises that teach you how to engage and strengthen the TVA. Most training programs focus on the 6-pack abs. That's why most of us have weak TVAs. Furthermore, most of us spend a lot of time sitting. Sitting further weakens the TVA.
When the lats and TVA cannot work together to stabilize your shoulder girdle, the shoulder girdle collapses. You end up dumping your bodyweight into your delicate wrists. You can also dump into the elbow joints, causing them to hyperextend.
So the stronger your TVA and lats get, the better your wrists and elbows will feel.
Take some rest days if your wrists are sore and focus on the exercises that don't implicate your wrists.
Here are few suggestions for modifying exercises:
Why do my quads cramp in hip flexor exercises and L-Sits?
If you have a hard time lifting your straight legs off the floor, it’s because you lack hip flexor strength. If your quads cramp when you try, it’s a sign your hip flexors are weak and need some work. That’s why hip flexor triangles and hip flexor raises are part of the plan! There are scaled variations provided in the routines.