Welcome,
Now I'm doing static strenght training (adv. tuck planche in 10 sets x 6sec).
I'm in 11 week of adv. tuck planche progression, and I still can't do straddle planche in correct form, when I'm trying to get straddle planche, my legs are bending but when I straighten my legs they are much lower than my hips.
How should I train to get longer advanced tuck planche holds(my max hold is something about 15sec.) and how to get correct form in straddle?