Skin the cat shoulder flexibility requirements: can you get there without rings?
The Role of Body Composition in Calisthenics Performance
This is a topic people approach carefully in the fitness world, but the physics is what it is: relative strength (strength per unit body mass) is what determines performance in bodyweight skills.
For horizontal lever positions (planche, front lever, back lever), the moment arm created by your body mass increases with distance from the pivot point. Carrying excess fat at the extremities increases this moment arm without increasing the force your muscles can produce. The math is straightforward.
This doesn't mean you should crash diet, and it doesn't mean you need to be lean to train. It means that for the same training inputs, a person at 15% body fat will hold a front lever before the same person at 25% body fat. That's not a moral judgment; it's mechanics.
For beginners, the composition conversation is premature — focus on building strength and movement. For intermediate trainees who have been training consistently for a year and are stuck on a specific skill, body composition is a legitimate variable to examine alongside training quality.