Water running can help runners improve running form. The resistance of the water forces the legs to find a more efficient path. Put on a floatation device and go to the deep end of a swimming pool (usually at least 5.5 feet deep). Move your legs in a running motion that replicates how you run on land—no knee lift, extending your leg a little forward, feet low but kick out a little in front, and bring the whole leg behind as the lower leg moves behind you. Start with 5-10 minutes and build up to 15-30 minutes. You can do this workout on a non running day, or as a second workout on a running day.