dd8f1431_How_Heart_Rate_Zones_Work__Description
[Heart Rate Zone] Anything Above Zone 5: Explosive Speed, PowerEnergy System: Phosphagenic max [Description] 
This intensity is primarily training your glycolytic and phosphagenic energy systems, and can involve sets of anywhere from 5 seconds up to a couple minutes in duration. Athletes who want development in their fast-twitch muscles, strength, explosive power, or improvement in cycling or running mechanics should include training sessions at this level.These type of workouts are typified by short, explosive intervals followed by long recoveries, and include powerlifting, weight training, plyometrics and short bursts of energy.
How Heart Rate Zones Work
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