Cardio for Bad Knees

A tough dilemma you have knee problems how do you lose weight or just stay fit.
A lot of us face the issue of exercising with bad knees so I know it's not fun. Fortunately there are a lot of great cardio activities you can do that are safe for your knees and great calorie burners. Such as:
Swimming: Swimming is a great low impact activity and you can put a buoy between your legs to make sure you use them to kick. Omit the push-off on the wall to protect your knees.

Upper Body Ergo-meter: It's a piece of equipment that some gyms have that looks kind of like pedals for your hands. Try doing 30 minutes alternating pedaling forward and backward every few minutes.

Kranking: Kranking is basically a high energy upper body ergo meter group class that is popping up nationwide. Look for it in gyms near you.

Kayaking: If you're near a place where it's warm enough to do it, kayaking is a great upper body workout that is easy on the lower body. Even those without bad knees, can get a great workout from kayaking.

Rowing Machine: This is a great option for building up lower body strength (or a good stepping stone to high impact activities). Almost every gym has a rowing machine and they're usually open, so try it out.

Stationary Bike: Stationary bikes are very low impact and many people with knee problems love to get their cardio this way — I'd stick with the recumbent bike as it puts the least amount of stress on your legs.

Elliptical: The elliptical is a relatively low impact form of cardio (compared to running and step) that a lot of people with bad knees enjoy.

So don’t feel bad you have choices, so no excuse for slacking off.