Modification - Keep feet flat on the ground as you go through the rotating movements.
Start from a standing position and step out with the right foot, lowering your body down towards the floor until the front knee is at a 90 degree angle, with the back knee also lowered down as close to the floor as possible, without touching it. Then return the front foot back to the starting position and repeat, or alternate the same movement on the left leg. You may choose to perform an entire set of repetitions on one side then move to the next or alternate sides until you reach your desired number of repetitions. Remember to keep a good posture when performing this exercise and make sure the front knee does not come past your toes.
Good luck with these exercises and feel free to change them up as you progress. Make these exercises your own through modifications or increasing difficulty as needed.
ACE - CPT
Zdeb, C. (2013, Feb 19). How to ...; exercise equipment-free bodyweight workout requires no machines. The Vancouver Sun. Retrieved from http://search.proquest.com/docview/1289247868?accountid=10357
(2008, July). Using Body-Weight Exercises. IDEA Fitness Journal. Retrieved from http://www.ideafit.com/fitness-library/body-weight-exercises