My gym workout is to Premium My Body Is Coffee Shirt run 1.5 miles as quickly as I can and then work on arms, core, or legs for 30 min before going home. You can adjust this as needed to what you can do on your run but go for about 20 min for your run pushing yourself as much as you can. Lastly, find a good reason for you to do this. Don’t just go at it on a whim. You need something that you can tell yourself every time you work out and get disheartened. It really depends on how overweight you are. If you are actually 20 lbs over “ideal weight”, it’s not gonna be easy. If you’re heavier than that, 20 lbs won’t be as difficult.
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Keep in mind, losing weight short term like that is hard to maintain. You really need to change your lifestyle to keep the weight off. Eat at a caloric deficit AND/OR start exercising/exercise more AND/OR increase NEAT (Non-Exercise Activity burnt when not sleeping or exercising, for example from Premium My Body Is Coffee Shirts walking, taking stairs instead of the elevator,…). A combination of the three is probably best, depending on your opportunities. It’s definitely possible, but you may want to reduce it. The rates of weight loss to avoid your hunger hormones to be messed up. And consequently, minimize the risk of eating your lost weight (and more) back.