Reflecting on the athletes of the Tour de France or elite marathoners, do you wonder what those world-class athletes have that make their bodies respond to the rigors of a race like that? I mean, 21 stages over 3,300 kilimoeters? (That's 2086 miles, friends!) And we're not talking doping here! It's fat burn. They have trained their bodies to rely on fat as the primary source of fuel. Zone training - working in Zone 2 Heart Rate - helps train the body to use fat for energy. By regularly exercise in zone 2 the body will adapt and become more efficient at converting fat to energy, leaving the muscle stores for those more explosive, dynamic movements.
Most experts agree that Zone Training alone is not the most efficient way to torch calories, but it is a valuable addition to your routine.