Here's the thing about athletes. They think about their bodies differently than the average gymgoer. They work out, get motivated and define goals -- all differently. And their way is highly effective. You don't need a sponsorship or superior genes to adopt this mind-set and achieve the body results you want.
Pretty much any activity that gets your blood pumping is cardiovascular. When your heart rate rises, muscle cells break down sugar and fat for fuel, burning calories. Clearly there are a ton of ways to do this, but exercise physiologists lump cardio into three buckets -- long, slow distance (LSD), medium hard (tempo) and high-intensity interval training (HIIT).