Simplify the following text for a Grade 11 native English-speaking person.
Original: Bodybuilders prepare for competition though a combination of fat loss , oils , and tanning ( or tanning lotions ) which combined with lighting make the definition of the muscle group more distinct .
Simplified: The muscles are revealed through a process known as the `` cutting phase '' - a combination of fat loss , oils , and tanning which , combined with the lighting , make the definition of the muscle group more distinct .