Slide show: Gear up to fitness with alternative bicycles

If age, back pain or physical disability keeps you from riding a bicycle, consider some of the newer models. Innovations in bicycles have made it possible for more people to get in the habit of cycling — even if your pedaling power isn't what it used to be. Here's a look at the most popular alternative bicycles.

A tandem bicycle lets you and a companion ride together. A tandem bicycle typically weighs more than a standard two-wheeler. But because you're sharing the extra weight with a partner, you each do less work than if you were riding separate bikes.

There's a choreography to riding a tandem bicycle. It might take some practice to get the hang of it — but soon you'll enjoy a comfortable ride.

Recumbent bicycles are easier on your back than are traditional bicycles. You sit down low, with your back supported and your legs in front of you. A recumbent bicycle can give your legs and buttocks a great workout.

Because recumbent bicycles are heavier than standard two-wheelers, they're tougher to pedal uphill and can be awkward to maneuver. Sitting low also makes you less visible in traffic.

Adult three-wheelers are a good choice if you have a disability or if you need more stability than a two-wheeler can offer. Adult three-wheelers usually have foot and hand brakes and one to three gears. Some three-wheelers are built for two people to ride at once, sitting beside each other.

If you have a condition that causes you to tire easily or makes it harder to pedal uphill, you might prefer a bicycle that gives you a little help — such as an electric assist bicycle. These bicycles are partially powered by an electric motor. You can pedal or cruise, depending on your energy level.

If you have a disability that keeps you from using your legs to pedal, a handcycle can give you the freedom to ride. With this three-wheeled bicycle, you pedal with your hands rather than your legs — often seated recumbent-style, with your torso reclined and your legs in front of you.

Interested? Get your doctor's OK to begin an exercise program. Then visit a bike shop and take an alternative bicycle for a spin. Always remember to wear your bicycle helmet.