By the way, if you're more than 20-30 lbs overweight, don't just take up jogging/running. You have a large chance of fucking up your knees. Both cartilage and ligaments can get permanently damaged that way, effects which could last a lifetime.
Instead, take up something like walking or cycling if you're seriously overweight. It will help you gain the muscle needed to reduce risk when stressing your joints, while also helping reduce your weight.
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