Renew Fitness USA

Did you Know?

Zone 4: Anaerobic zone (80–90% of HRmax). This high-intensity zone burns more carbohydrates and less fat but a higher number of calories per minute. This zone is hard to hold onto for long – it’s uncomfortable and usually an effect of pushing yourself hard or intense competitions. Benefits of anaerobic training include improved oxygen consumption and higher lactic acid tolerance for enhanced endurance. In this zone, you reach your Anaerobic Threshold (AT), the point at which your muscles are producing lactic acid faster than your system can flush it out. This zone feels uncomfortable. You're breathing really heavy and are only able to utter a few words.

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