Stiff leg deadlift is an excellent exercise for building strength in the hamstring muscles as well as the lower back and is a good compliment to the squat exercise, typically done in conjunction with this move. Stiff leg deadlifts are a very intense move, meaning you should only train them once or possibly twice per week and always do them towards the start of your workout program when you have the most energy. Watch a demo... https://www.exercises.com.au/stiff-leg-deadlift/