Why do i feel physically tired all the time? i am an ex football player so i am always active, mentally im good, not just physically. im always tired.

See your doctor: Fatigue in a previously active and healthy individual warrants a visit to your family doctor or internist. Possible causes include anemia, hypothyroidism, diabetes, and other possible issues.

Check up : Multiple potential causes from metabolic conditions such as diabetes, thyroid disease; you could be anemic; you could have sleep apnea; can be stress related; numerous other possibilities. A good medical check up to discuss with your primary care doctor would be a good place to start.