Chubby knees come from excess body fat stored around your knees. The main thing you have to do is drop the body fat, and you do that primarily through diet. That said, however, the best exercises for fat-burning are running and cycling.
Walking is good too (easier on the joints than running), but you'll have to walk twice as far as you have to run to burn the same calories. You have to create a negative calorie intake (eat less calories than you burn). You can decrease your food intake, increase your exercise, or a little of both.
It's important during a fat-burning phase to maintain as much lean body mass as possible, and the best way to do that is to train with weights. You don't need to go heavy, but train to the point where your last rep is moderately hard. Do sets of 10-15 reps per exercise, and work out your largest body parts first.
Eat 6 smallish meals rather than 2 or 3 larger ones. You'll experience less blood sugar level fluctuations and consequently won't have the ... more.
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