Yes, I believe they do work, but you need other exercises besides that. If you can't get outside, try going online
and check out some of the exercise
routines. Spark people has a lot, so does live strong and if you do a search for exercises, I'm sure you will come up with a lot of other web sites from which you can get ideas for exercises, It will help to do different things. You can also get inexpensive exercise dvd's and some cable channels have an entire exercise channel.