The traditional plank works out not only your abdominal area, but also your thighs and butt. :) A side plank does all that and works on the muscles in the arm supporting the plank.
core
(Strengthen your muscles)
The antagonist for plank exercises are the muscles on the front of the body, particularly the muscles of the hips and abdomen, such as the hip flexors and rectus abdominis. These muscles work in opposition to the muscles engaged during a plank, which are predominantly the muscles of the back, core, and shoulders.
One minute plank holds will help strengthen your core by the second! (Usually go for about a minute or more)
No, I constantly do this in ballet and yoga and it just helps strengthen yourself
A plank primarily engages the back, shoulder, and abdominal muscles. Most notably, these include the erector spinae, rectus abdominis, transverse abdominus, trapezius, pectorals, and deltoids.
Strengthen your abdominal muscles.
To get your legs to strengthen by running and running because this is using your muscles and that helps your legs to strengthen.
By working your whole body. L-Sit is a very demanding exercise that uses your whole arm muscles and your core muscles. This is why a strong core and strong arms lead to better success in the L-Sit. You can strengthen your abdominal muscles with exercises like plank, hanging leg raises, dragon flags etc., and you can strengthen your arms with exercises like chin-ups, pull-ups, dumbbell curls.
The exercise ball will strengthen different muscles depending on how you use it. It's probably most popular and frequently used for an abdominal work out.
When exercise is done the muscles are broken down. The muscles are then repared back stronger.