For clients with coronary heart disease, the NASM CPT7 guidelines recommend avoiding prolonged isometric holds because they can significantly increase blood pressure, placing unnecessary strain on the cardiovascular system. The study guide emphasizes adjusting tempo to reduce extended isometric contractions and focusing on controlled concentric and eccentric actions to maintain circulation and avoid excessive cardiovascular load. Recommended programming includes low-to-moderate intensity, gradual warm-ups, and monitoring of exertion levels, often using the talk test or RPE scale for safety .
According to the NASM CPT7 Study Guide, Zone Two in stage training is characterized by working just below the anaerobic threshold, where the body transitions from primarily aerobic energy production toward greater reliance on anaerobic systems. This zone corresponds to an intensity where the client's breathing rate increases but is still manageable for extended periods. The guide explains that in stage training, Zone 2 is designed to improve the ability to sustain higher intensities for longer durations, enhancing lactate threshold and aerobic capacity. Training near the anaerobic threshold challenges the cardiovascular system while still being sustainable for a moderate duration, making it ideal for endurance development and preparing for higher-intensity efforts in Zone 3 .