Performing the: A Step-by-Step Tutorial Assisted Prone Hamstring
Have your partner or trainer stand at your feet. They should gently lift one of your legs, bending it at the knee while keeping the other leg flat on the ground.
Your partner should slowly raise your foot towards the ceiling, stopping when you feel a stretch but before it becomes uncomfortable.
Hold this position for about 20 to 30 seconds, breathing evenly throughout.
Gently lower your leg back down to the starting position, then repeat the process with your other leg.