What are some of these unwanted signs of aging? They can include osteoporosis or weakened bones, loss of muscle, weight gain that is mostly fat, bodily aches and pains, fatigue, sweating, hot flushes, decreased libido and poor sexual performance, deteriorating memory, irritability and even depression. Exercise is extremely important for a couple of reasons. You need to train hard in order to boost your testosterone levels. Try to frequent a gym for at least 4-5 days a week. Strength training is excellent for increasing testosterone in your body.