Training body tension without boards

I won’t have access to any climbing for the next two months and thought it would be a good time to go all in on off the wall training.

I’ve a general idea of the approach I want to take and specific areas to improve that I know I can mimic with off the wall excercises. but the one thing I’m stuck on is general body tension.

Pretty much any move that has me spread out and requires tensions and tucked in hips shuts me down. Wondering if outside general core work are there any comparable excercises to try and engage the style of movement/strength requirements?