work harder. C'mon really? Surely you know, unless you're looking for some sorta magic pill that doesn't exist....

Take a read through posts here and where ever you'll find a great multitude of them discussing stamina, with muscular endurance, anaerobic and aerobic, etc.

Sorry if this seems a bit short, but it is such a frequently asked question with the most obvious of answers yet still it seems no one ever is inclined to search a bit. hint "Search function"

Ah someone will prob come a long and regurgitate it all again for the eleventybillionth time, but really. Cmon.

sorry im grumpy today.