Explanation:
Regular cardio, strength training, workout for improving muscular endurance, and flexibility exercises are all going to contribute well towards a healthy body fat content. Together with healthy eating you should be able to achieve your fitness goals.
Answer: It would be the last option, the essential amino acid content. Determining the quality of a protein is determined by assessing its essential amino acid composition, digestibility and bioavailability of amino acids
The answer is sexual activity.
I hope this helps!