This movement is called the Pistol Squat,
which works your hamstrings and gluts. You wanna keep a nice, light grip on the TRX here.
Keep one leg up. Come as close to the ground as possible and then push through the heel
to come right back up. Alternate your legs on this one. Try not to use the upper body.
Nice, light grip on the TRX. No death grip on this one.