I need to build up my stamina and cardio..?

Question

How can I increase my stamina and such in 3 weeks

and by how much..

i need to get back in shape for soccer season.

I play center midfield so I'm running all over the field

nonstop and usually I have to play for the whole game.

HELP..!

Answer 1

Run, run a lot, if you're not running ride your bike.  To build endurance and agility run on hiking trails.

Answer 2

Just by some good running shoes and start running. By the end of the 3rd week try to be up to at least 4 miles. You'll be fine. Make sure your having fun with it though. Running isn't cool unless your having fun with it.