Hey all, new to bicycling and the forums. I'm 6'4" and 230lbs. Not too big but I do got a gut I'd like to get rid of. I have 2 questions. I just recently got my first real bike. It is a mid-eighties Nishiki Olympic 12, aluminum wheels. With my build should I be careful/gentle with the bike? or no consideration at all at 230? Seems stable so far going over the wide speed bumps which are all over Chicago's side streets.
Also, is bike riding 20-60 minutes a day by itself a good workout regiment, or would 5-10 minutes of sit-ups/push-ups a day make a Huge difference? Atm planning on just bike riding.
Edit: I am looking to take it slow, have never really exercised before lol. So, better put, is just bike riding a good enough start?