See now we are getting some where.
ITs all related. When you get stronger stomach/leg muscles(by biking) its will help you walk faster and for longer.
See how every thing come together in cross training?? I swear with little change in how we look at work out can make a major difference.
NO It wont give you a heart attack. You will love it. I see so many mom on bikes leading their kids(who are also on bikes.)
You will love it.