Final answer:
To improve aerobic efficiency in phase 2 of the IFT model, a trainer should increase exercise intensity and frequency and adjust targets accordingly, leveraging methods such as interval training to enhance cardiovascular endurance and oxygen efficiency.
Step-by-step explanation:
To improve aerobic efficiency during phase 2 of the IFT model for cardiorespiratory programming, the trainer should focus on increasing the intensity and frequency of the aerobic exercises while also tailoring the target goals to meet the individual needs of the person being trained. Strategies such as interval training, which alternates between higher and lower intensity, can be particularly effective. By gradually elevating the intensity, individuals can stimulate adaptations in the body that lead to improved oxygen use, enhanced cardiovascular endurance, and increased utilization of fat as an energy source during workouts.
Aerobic exercises like cycling, brisk walking, and running are optimal for enhancing aerobic capacity as they involve sustained muscular activity that is powered primarily by the aerobic energy system. Recommending a balanced routine that includes moderate exercise for around 1 hour per day could be a method to progressively build up endurance and cardiovascular health.