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.
As you move through the water using a standard stroke such as the front crawl, breaststroke, backstroke or butterfly, you're using virtually all your muscles from head to toe. Upper-body muscles that you'll use while swimming include your pectorals, deltoids, biceps, triceps and wrist flexors. Lower-body muscles include your calves, quads, hamstrings and glutes. Swimming also requires the use of your core muscles.