If you don’t think it does, just stop doing it for awhile and then go back and see how you feel. For years I did water aerobics and I did them seven days a week. I then went down to six days, then five days and then I started watching the thermometer. If it was under 50 degrees I did not go, then 55 degrees and so on. Well, you know what happened, I stopped going all together because the mornings were pretty chilly. Luckily I have friends that don’t give up on me and make it their mission to get me back in the pool. The weather has been in the 80’s the past few days, which makes the mornings in the high 60’s. The pools are heated to 84 degrees, so it is very pleasant and I had no excuse for not going, other than sheer laziness on my part. I got ready, brought my swimming paraphernalia out to the car to put in the trunk, forgot my keys and went back in to get them and be on my way. Came out, jumped in the car and promptly drove over my equipment. The amazing thing is that when I heard the funny noise I kept right on backing up trying to figure out what the noise was. When my intellect could not figure it out I stopped the car, got out and there was my equipment under the car, instead of in the trunk. I pulled forward retrieved it, and thought only the bag had holes in it from the muffler. It was together enough to hold everything so I went on my way. When I got to the pool and got my weights out I noticed the ends were broken, but it did not effect their effectiveness so that was fine.  Then the funny thing was, because this was a deep water class we wear arm bands, mine now had skid marks on them. I looked around to see if anyone was looking as I tried to rub the marks off, but to no avail. They didn’t come off. I put them on anyway, and actually thought I looked pretty tough with skid marks on my arms.  Needless to say I was not too tough.  I had not been in quite awhile and any doubt I had whether water aerobics gave me a good workout was immediately erased, as exercises that were easy when I did it all the time, were no longer easy.  I fought cramps in my ankles, feet and legs and now know that I have to get back into the routine of getting out to exercise.  As you do feel good when it is over. Exercise does work and so does friendship.   Thanks, my cool weather friend, for not giving up on me.