Why is my nut sack hard?

What are the biomanical principles of doing a pushup? What are the common causes and treatment options for lateral scapula winging? Why do my feet hurt during HIIT workouts? Is it important to match your exercise shoes with the type of exercise in which you will be participating? What is an example of cardiorespiratory fitness? What is foreskin stretching exercise? How does racial variation affects basal metabolic rate? How can I safely practice climbing at home? Should I do squats barefoot or with shoes for better performance and safety? What do bodybuilders wear? Why are people today not getting enough beneficial exercise? Do girls wear tight pants and spanx? Should i exercise with a sore throat? What are the safety precaution in dancing? What are the symptoms of overtraining? What is a recommended Planet Fitness routine for beginners looking to improve their fitness level? How much fat will I burn on a treadmill if I walk, compared to run? What is mean by synergistic effect? What is the best healthy snack option for maintaining a balanced diet and promoting overall well-being? What factors should be considered when designing a volleyball training program?