Which fitt principle concept refers to flexibility, strength, and endurance? intensity frequency time type

Type concept refers to flexibility, strength, and endurance

Explanation: The type of exercise you choose in your workout regime determines your result. For example, if a person wants to enhance strength and endurance they would opt for weight and cardio training rather than swimming.  

The other factors of the FITT cycle are as follows:  

Frequency: This is how often we train. How often our sessions are planned (e.g. in a month, week etc.)

Intensity: this is how hard you work out.  

Time: How long your training sessions are or length of the activities that take place during the training session.

So the best option would be Type, after looking at the above explanation

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alternate days of the week that you perform that activity