See a physician before starting a new exercise plan, especially if you aren't used to exercising. Discuss your general health and any concerns you have about starting to exercise. If you have unknown health problems you may do inappropriate exercises, or you may overdo it and cause injuries. As your fitness level increases you can do more intense and long lasting workouts.
To successfully catch a pass in football, try shaking up your defender. What you need to do is run close to the defender. The closer you are to them, the easier you can get it and run past them. Try shorter strides to run faster when you start getting close to them so that you can really speed past them when you catch it.
Avoid over exercising when you become sick. If you get sick, your body is a little more weak because it's working hard to heal. Your body will not be able to build muscle and endurance during this time. Because of this, you should stop exercising until you recover. Just try and eat healthy and rest until you can get into shape.