4 The Purpose Of Cv Fitness , Walking 1 Mi @ 4mph = ? Miles Of Bike Riding A @ ? Mph?

I need to get in fairly good shape and, due to injury orthopedic operation is not an option

Thus, the plan is to combine cycling and swimming in open water to get there
Open water because I hate swimming in the polls, too boring.

Thank you

What Helps Improve The Cardiovascular System And General Fitness Better, A Treadmill Or Exercise Bike?

I just joined a gym, and my mother wants it, but cannot afford the price of payments. it is looking to buy a treadmill or bike for us both to use at home, but we would like to know who contributes more than cardiovascular fitness and general?