HAMSTRINGS

The reason hamstrings are considered part of the core muscles is because they aid the movement of our torsos backwards.  The tighter your hamstrings are, the bigger negative influence on your core strength.  It is very important to exercise and stretch your hamstrings.  The chair bridge will work your hamstrings along with your gluteus maximus.  Squats, lunges,  back leg lifts, and bent leg dead lifts are also great exercises to strengthen and stretch your hamstrings.