There are lots of different exercises in Calisthenics. But it depends on which age group that you are in, in which exercises you do.
The youngest age group is Babies then Tinies, then Sub-Juniors,...
No, calisthenics involve working out with ones body weight, such as pull ups, pushups, etc. Isometric exercises involve no movement and staying in a static position.
Having your lower back on the exercise ball, you can do crunches. The ball allows for a larger range of motion.If you stand on it, you can do squats. The balance aspect is very good for the core.You...
Most are most like Bo Flex are not trusted. Try some old fashioned running up and down stairs for your legs and try lifting yourself on a tree branch for your arms and abs.