Sit comfortably, right at the back of your chair with your lumbar supported if possible. Check your pelvis is upright (up on your sitting bones) spine long, all the way to the top of your head. Arms are in goal post position, forward of your shoulder joint, fingers spread. 

Watchpoints: keeping your hips level, pelvis neutral and your spine long is the priority.  Try not to hunch forward and curve your spine. Your hamstrings will release even with your knee still bent. Do not do if you have a hamstring tendinopathy.  If it hurts, stop and consult us.