In the context of cardiorespiratory training, refers to the number of training sessions in a given time period, usually expressed as per week.

Frequency refers to the number of training sessions in a given time period, usually expressed as per week.  

Explanation:

Cardiorespiratory training helps an individual to achieve his/her unique fitness goal. Oxygen is efficiently supplied during cardiorespiratory training to all parts of the body to get strong heart, healthy lungs, and clear blood vessels.

Walking, jogging, running, cycling, swimming and aerobics are some of the aerobic activities that can be done to improve cardiovascular fitness.

Sports activities like basketball, soccer, squash and tennis can be played to improve cardiovascular fitness.

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