Explain why improving cardiorespiratory fitness and muscular strength and endurance are considered good strategies for improving body composition.

Improving cardiorespiratory fitness and muscular strength and endurance are considered good strategies for improving body composition because it increases the rate of heart bit and this results in a fitter heart and fitter body. This will keep the chance of heart attack away from the person. I hope it helps. 

The average resting heart rate (hrrest) for a 34 year old is 73 beats per minute2. 34 year old males average heart rates of 71 bpm while females average slightly higher at 76 bpm2. the normal resting heart rate range for all adults and children 10 and over is between 60 and 100 beats per minute3. 90% of 34 year olds resting pulses fall within the range of 54 to 92 bpm. in general, an adult's resting heart rate will be lower for those in better athletic condition.