I can do a backhand spring on floor with pretty straight arms but once I try to put my hands together my body just collapses. All my coaches are inexperienced high school boys so they can't help me with anything.
My daughter was not allowed to do this skill with out proper coaching, but tumbling up is something the girls do at her gym. The mats get higher the weaker the arms are. The girls that had bent arms or trouble doing this skill also were required to condition more to help them