The L-sit exercise is a great workout for your abs, but the rest of your body will benefit from this core body exercise as well.
How to perform the L-sit
Keep your legs straight in front of you in a 90 degree position and hold this position as long as possible. Your full bodyweight should be carried by your arms. You can either rest on the ground or two parallel bars. To add more difficulty you can perform an L-sit on your finger tips as shown below. Alternatively you can do the L-sit while hanging on a bar. The L-sit hang is easier, because it puts less strain on your chest and shoulder muscles.