What is the best routine for using exercise bike?

shaunybhoy asked: I would like to start exercising on exercise bike each day, have on average 30 minutes free to do this. I already do other exercises like take dogs walk etc. I was just wondering how I can get the most benefit from using the bike.

The exercise bike has a tension area in [...]

What kind of used bike would you recommend for commuting and exercise?

HOLLER! asked: I’m looking for a used bike that I can ride to class (1-2mi) and ride on paved bike trails for exercise. What kind of bike should I be looking for? I’m not looking to spend a lot because I am a poor college student.