Skating

It's not for everyone.  I'll start with that.  You might need lessons if you have never done it before.  Concentrate on stopping.  That's really the key.  But if you know what you are doing then skating gives you as much exercise as running and it is a whole lot more fun!  Just be sure to NEVER fall.  And in the event you do fall be sure you are wearing a helmet, elbow pads, wrist protectors, and knee pads.

I skate outdoors, on streets and sidewalks.  Typically skating for an hour or two every other day.  It's great for balance and stamina.  I guess the toughest part is concentrating on the road ahead.  Even the slightest rock could trip you up.  You have to be vigilant.  Get yourself good skates.  I recommend Rollerblades - particularly the kind with advanced braking technology such as ABT.  It works and it is easy to use.  You still can not stop on a dime though.

But if you are willing, healthy, and safe, then give it a try.  There is nothing quite like the thrill of skating and the feel of the wind through your hair.