I've been having issues with my knees for the last few months and haven't been able to run in about two or
three months now. While running, I was also cycling. Now I pretty much do cycling most of the time. Here's some advice for everyone.
1. Make sure you get some weight training/resistance training in there. Even if you just do weight training with house hold objects, like soup cans or gallons of water (for a long time I was using an old WWII rifle as mine, so you can really find anything, just make sure it is balanced). Cardio is great, but to cut down on body fat you need to do this two or
three times a week, but not days in a row. Give at least one day between each session.
2. If you can get outside to do your workouts, do it. I
cannot ride a stationary bike. I am terrible at it. I got on one this evening at the gym and made it 15 minutes before I just couldn't stand it anymore. Had my iPod going, was watching a TV with no sound... still couldn't do it. But on a bike - and a bad one, at that - I can do 30 mile clips. If you can't go outside, make sure you distract the heck out of yourself. Favorite movies, fast paced music, etc. Check out iTunes, they have workout music that is designed to keep pace. I use it when running (
never when cycling outdoors).
3. Pay really close attention to your posture on that bike, whether riding outdoors or going stationary. If your backside hurts, you need to raise the seat. But
watch your knees. Cycling is very knee friendly, unless you do it wrong. Then you can seriously hurt yourself. Keep adjusting, you shouldn't have your knees pointed too far out or too far in. It will raise heck on your tendons. You may feel silly, but try to mimic professional cyclists the best you can. Look at some pictures and pay attention to the knees, feet, and ..... And make sure your bike fits you. Bikes - your feet should just about touch the ground when you are in the saddle (really, you should be able to stretch and touch the ground with your toes). Get help being fit to a bike. This saves you injury later. Stationary - go for comfort and posture. I was on one tonight and couldn't touch the ground at all when in the saddle.