One who dabbles.
A person who indulges in a sport or pastime on an infrequent basis, usually on weekends when work commitments are not present.
Such was the pace with which I, and many like me, the so called ‘weekend warriors’ or Territorial Army, were hoisted aboard the Gulf War battle wagon.
The most common foot-related injury I see for the weekend warrior is heel pain.
A part-time soldier, or reservist