Put your right elbow and forearm on the floor. Put your legs on a step or two, according to ability. (Two steps are harder than one step.) You can put one ankle on top of another or cross them. The latter is the easier position. Raise yourself in a wedge with your head, neck and back straight. Raise your right leg, which should be the leg closer to the floor, two or so inches in front of your left leg, which is still resting on the step. Repeat as many times as you can. Breath out when you raise your leg. Turn around and repeat, raising your left leg.
Disclaimer: None of the above information can be taken as a substitute for advice from a medical professional such as a physician.
My third book, Pocket Guide to Fitness, is available on www.louizapatsis.com, http://www.authorhouse.com, www.bn.com and http://www.amazon.com. If you look up my name on those Web sites, you will find my other books The Boy in a Wheelchair and Life, Work and Play: Poems and Short Stories.