You can use this hamstring routine at the end of a leg day. If you start with the quadriceps, you should finish with the hamstrings.

THE ROUTINE

1) Standing hamstring curls or

Lying hamstring curls (for the lying hams curls - see an additional video for the special routine, to make every rep even harder. Also see another video for this exercise to learn the proper form in order to engage the hamstrings to the max with each rep)

2) Seated hamstring curls (see an additional video for the special routine of this exercise. This way, you will achieve total failure)

The angle of all 3 exercises is not the same, resulting in more hamstring activation. It is always better to hit the hamstrings from more angles. Also, you can change the position of the feet:

1) Toes to inside - inner part of the hamstrings activation

2) Toes to the side - lateral hamstrings activation

3) Toes in parallel position - full hamstrings