High on burning calories

Let's say I wanna lose 50 punds in a week. What sport do you reccomend me?

50lb in a week? starve yourself, while running 24/7.  there's no way to lose that much weight in a week. 

be more realistic with your weight lost goal.  but if you're serious  www.johnstonefitness.com  will probably help to get info.  cut off fatty food and eat healthy with exercise and body building.