I have recently felt when im on my stationary bike when my knees go up when there going around the cycle my lower abs and upper abs feel harder, does a stationary bike help tighten ur abs?
small research has shown the just about everything can help your abs since they are so central to the rest of your body. very often abs are getting crunched or balancing a part of the body getting crunched so they are constantly working out. so yes it does.
