Well its just weird. I mean, I can lie down on the floor on my stomach in straddle position, but i can't hold it in planche position. I start in tuck planche and then extend my legs, but once i get to a certain point, there is just an immense amount of resistance on the back of my legs and i just feel that i cant open them so they're straight, i can just hold it in a bent position.
The same goes for front/back lever. I can't do the back straddle, and i cant do front straddle with straight legs, but i can do the full front lever. I just skipped the straddle altogether.
Is this a flexibility problem?