Running half a mile or a mile takes maybe minutes including putting on running attire and taking a shower afterwards. Generally, by training your muscles ; There are a lot of exercises. I hope this is at least a bit helpful. Get fit and then show them! You cannot get from zero fitness to running 5 miles or doing 10 push-ups within a day.
Lexie. Age: 28.
This actually means slight underweight.
Helen. Age: 23.
Let's get fit!
If it is others you are concerned about grinning or laughing at you, because of your weight or of your lack of fitness , the best way to deal with them is by paying no attention to them. Because if you follow through you will feel an increase in your fitness. I believe you will feel better when you complete a workout session. And believe me, if you keep going you will notice a steady increase in your fitness.