When we sit a lot or have other postural imbalances, our psoas can get shortened and weak, which can cause the pelvis to tip anteriorly (forward). An anterior tilted pelvis will pull the hamstrings and make them feel tight. In this Reset® class, we open and activate the psoas, and work the hamstrings. You will need a blanket and a hard floor for this class. The amount of friction between your blanket and floor will impact how difficult it is for your hamstrings to work. So consider trying different blankets if you find these exercises too difficult. My teacher Lara says that if your hamstrings cramp, then your hamstrings are weak and you need to do this work! However you might need to take it a little slower than the number of reps done in this class. Keeping your pelvis on the floor instead of lifting it in the second exercise (both feet on the blanket) will reduce the demand on the hamstrings as well.