Nordic Hamstring Curl.

The Nordic curl is almost pure eccentric work, and few exercises load that part so hard. You lower against gravity, fighting the descent while the hamstrings lengthen under load, which is the precise stress that builds eccentric strength and toughens the muscle. The research behind it is unusually strong: programs built around the Nordic curl have cut hamstring strain injuries substantially in sprinting and field sports.

It is brutal, and almost nobody can do a full one at first, so expect to drop fast for the first few sessions. Scale it three ways. Lower only as far as you can control before catching yourself, loop a band around your chest from an anchor overhead to share the load, or push off the floor with your hands on the way up. Add range across weeks. Fighting a full unassisted descent on day one just plants you on the floor having learned nothing.

Mind your knees and lower back. Kneel on a pad, hold the hips extended so the body makes one straight line from knees to head, and keep them from piking back to shorten the descent. The line stays rigid and only the knees open.

Keep the reps low, 3 to 6, because the eccentric load is high and the soreness is real, and slot it after your main hamstring work as a strength and injury prevention piece. Stack it with a seated or lying leg curl for knee flexion and a romanian deadlift for the hinge, and the hamstrings have nowhere left to hide.