Ricky sayegh md Proficient tips provider. Exercise at least once a day. Exercising decreases body fat and tones and strengthens muscles, therefore causing weight loss. Start off by doing strenuous exercise for about five minutes, then each day after, add a little more time, working your way up to 30 minutes. Once you are able to exercise for 30 minutes, try exercising for a longer period of time or more strenuously.