During moderate- to high-intensity exercise, your muscles and tissues demand more nutrients and oxygen, which means that your heart must work harder and pump faster to meet those needs, says preventive cardiologist Haitham Ahmed, MD.
The role of increased blood flow During moderate- to high-intensity exercise, your muscles and tissues demand more nutrients and oxygen, which means that your heart must work harder and pump faster to meet those needs, says preventive cardiologist Haitham Ahmed, MD.
The backpack's main force that it it is exerting on the body's back and hips is coming from gravity, and can pull the spine downwards. This is why it's important to ear both straps.
