For example, if you are cycling, wear a helmet. If you play squash, use eye protection. You've probably heard that you should stretch before exercising, but do a short warm-up first. Go for a short walk or cycle or stand in place and pump your arms and legs. Then do some easy stretching.
Many people tend to hold their breath while they exert effort with their muscles.
This can seem strange at first but it is the correct way to breathe while exercising. Most people need to drink extra water or other fluids as they exercise and sweat. Many seniors become dehydrated easily, even when they are not exercising, so unless your doctor has told you to limit fluids, you should be sure to drink enough. If you need to bend over, bend from the hips and not from the waist. You'll know you're doing it correctly and safely if your back is straight.