Originally Posted by
Jay Gloab
It's called a pull buoy. Very handy if you're trying to avoid using your legs.
+1. If you have swim fins, they will have the same effect, as long as you keep moving, as water moving along the fins provides left to keep your legs up. Don't kick with the legs; just let them trail behind. I used to do this while snorkeling; on the surface, I gave my legs a rest while on the surface by swimming with my arms.
Keep in mind that you can still do some ab and core exercises, plus some exercises that isolate your good leg. Oh, and one thing I learned the hard way, while waiting for a patellar tendon to heal: EAT LESS than when you were active. Those love handles can sneak up on you, and will never want to go away.