Serious viral pneumonia is more likely to happen in those with a weakened immune system, such as: Babies who are born too early. Children with heart and lung problems. People who have HIV/AIDS. People receiving chemotherapy for cancer, or other medicines that weaken the immune system.
Lower back pain: How exercise helps. When you're in pain you may feel like resting, but staying active is good for your back. Exercises for lower back pain can strengthen back, stomach and leg muscles. They help support your spine, relieving back pain. Ideally, choose activities that involve endurance,strength and flexibility such as walking, swimming or cycling.
Muscle Repair. Stretching your neck and calf muscles before and after swimming can help reduce the chance of muscle strain. If you experience a neck or calf muscle strain from swimming, rest that muscle for a few days to let it heal. Continuing to train can cause the strain to worsen.