I heard the elliptical is not good for the knees and posture or something along those lines. How about HIIT? have you ever heard of that? High Intensity Interval Training. You will burn a lot of calories doing that and you won't need to spend that much time doing cardio if you do HIIT. You can do it on the track or the bike or any cardio machine that will not mess up your knees or affect posture. I also don't like treadmills because the floor moves for you and it feels like cheating to me. It's also hard to do HIIT on it and its bad for your knees. Ask someone who runs the treadmill to run the track at the same mph as running the treadmill and last for the same amount of time. They won't be able to do it. I have tested that myself and found that to be true. The only cardio I ever do is the track now or running/sprinting in an empty room. You want as much free range of motion as you possibly can get. Same goes with machines vs. free weights. It is easy to cheat using machines than with free weights.
Get MM by mike robertson. You will benefit from it (lower body dynamic stretching). Also get inside out as well for your upper body. They also have a product out called bulletproof knees by mike robertson, so you can check into that too for your knee health.
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