This exercise is designed to improve hamstring and glute strength which also helps your core to stabilise the lower back. It is also challenges our ability to maintain neutral spine in lying by using our deep core muscles.
Demonstration and Instructions
Breathe OUT and keeping a neutral spine raise bar by pulling both of your feet back towards your bottom as far as you can go without losing neutral. Breath IN and lower one leg away so you are only holding the bar up with one leg and then slowly lower the other leg and bar. DON'T arch back or lose neutral. Repeat with the other side, do more on weaker side.