To do Cherry Bombs, start seated on the ground with your knees slightly bent and feet flat on the ground. Then lift your heels up off the ground and slightly rock back so that you are balanced on your butt. Draw your knees in toward your chest and wrap your arms around your shins.
Then open up, lying back on the ground without fully relax down and open. Keep your abs engaged and your shoulder blades slightly up off the ground as you open your arms up and out overhead. Also, keep your legs off the ground as you straighten them out and open them up wide. You should almost look like a big X on the ground with arms and legs out and open and your low back pressed against the ground.
Feel your glutes work to open your legs out wide as your abs are braced to prevent your low back from coming up off the ground.
Then come back to seated, drawing your knees back in as you wrap your arms around your shins. Try to keep your feet up off the ground the entire time.
Repeat, opening back up without completely relaxing back onto the ground.
Beginners may need to do the tuck without the full range of motion. They may need to perform more of a crunch instead of coming all the way up to balanced on their butt. To make the move harder, open your legs up while keeping them as close to the ground as possible. Kick them up and out wider higher off the ground to make the move easier.