Think F.I.T.
To make physical improvements, you need to work your body harder than usual. This is referred to as the overload principle. As your body becomes more conditioned, you need to increase the frequency, intensity, or time of your workouts in order to continue improving your fitness level.
Frequency: How often you exercise. For beginners, consider starting with 2-3 sessions per week.
Intensity: How hard you exercise. For example, the pace you walk or run, the amount of weight you lift, or your heart rate count.
Time: How long you perform an activity. ‘Time” can also refer to the number of sets or repetitions you perform in weight training.