What is anerxity?

When you arms bend to pull up your body doing pull ups which will contract triceps or bicep? Why dos your left knee not jerk when the doctor hits it with a mallet? Does cardiovascular exercise result in contractile protein adaptation? What are some recommended dumbbell exercises for beginners, and do you have any pictures to demonstrate proper form? How might an aerobic activity be different for an individual who is thin compared to an individual who is obese? What are some recommended lactose-free protein sources for individuals with lactose intolerance? When beginning a cardiorespiratory training regimen it's best to plan for how many session per week? What if you eat protein but don't workout, will it still be beneficial for your body? What are the dimensions for the dumbbell rack that comes with the "Cory Everson Dumbbell Set with Rack - 32 lb."? What are some short term effects of urbanization? Does the Stex 8020T Treadmill have variable inclines? How many time do you have to walk around a football field to walk a mile? Is it more important to have strength or power in sports and fitness? What are the benefits of incorporating a variety of exercise movement patterns into your fitness routine? Where can I find exercise trainers near me for personalized fitness guidance and support? How long should I wait before I can workout after eating my breakfast or lunch? Does running burn abdominal fat? What should you do right after you finish lifting weights to gain muscle? What muscles does a side plank work and how can I effectively engage them during this exercise? What are the short and long term side effects of depression?