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Fitness Fundamentals

The 3 Building Blocks Of Fitness

SELF | Posted 05.10.2014 | Healthy Living
SELF

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).