You don't want to use a flash, however, if you are shooting sports outside. Even indoors you may be able to use the daylight coming in from a window rather than overhead lights. Trela says that when using a flash you should be within 15 to 20 feet of the subject. Indoor shooting may require you to adjust your film speed to accommodate too much or not enough light. Trela suggests using a filter that attaches to the lens of your camera to eliminate lighting problems.
Most filters are fairly inexpensive and can be purchased at a good camera store.
He keeps a filter on his camera at all times to protect the lens and make his outdoor shooting a little crisper. Keep your elbows tight against your body and your feet apart for better balance. An auto-focus camera still needs to be held with a steady hand. Film is cheap. Always bring double the amount of film you think you will use.