Thanks to a variety of factors — rising fuel costs, a more widespread interest in DIY technology, even fashion concerns — serious attempts to harness the energy produced by a pair of wheels and a well-turned ankle are no longer the anomalous terrain of a few fringe thinkers.

Tired of your steady old bicycle? Then take a look at these six crazy concept bikes!

By Alastair Bland

With beaches around San Francisco closed from a nasty oil spill, can Paul still enjoy being outdoors without getting bummed out?

For too long, Paul neglected an important relationship in his life. Then he discovered a winding path that put him back on track.

What has a bum knee taught me?

It can be a welcome excuse to blow off any exercise I don't like, and an annoyance to endure for a sport that I love.

Are energy bars hard on your stomach? Try a gel.

Holiday craziness is a great reason to skip workouts. This year, to make sure I get in regular exercise, I've lined up some workout buddies who don't want to hear any excuses.

Tina interviews Marla Strebb the professional mountain bike racer about her experiences as a woman in the predominately male sport of mountain bike racing. Marla also gives great training tips for novice bikers.

A British researcher says that it could be dangerous to wear a bike helmet in traffic because — bizarre as it sounds — wearing a helmet could increase the odds of a crash.