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They say 80% Diet and 20% Exercise. But still exercise play a very important role in weight loss. It improves Ur metabolism, BMR rate, gud for lowering BP, cholesterol, reducing stress hormone cortisol ( a hormone which is responsible for belly fat and bloating).
During exercise Ur body releases HGH Hormone (Human Growth Hormone) which is helpful in burning stored fat. Also happy hormones like endorphins. Ur nutrient absorption will be better, esp when u r active whole day.