Josh might get an overuse injury if he
a. skips his warm-up and cool-downs
b. cross trains too much
c. has non-specific goals
d. performs rehabilitation exercises

Josh might get an overuse injury if he skips his warm-up and cool-downs and cross trains too much. Overuse injury happens when there is repetitive use of the muscles or certain parts of the body and not allowing it to rest or cool down. This usually results in the damage of a muscle, bone, tendon or ligament. 

If you under eat, your bones will narrow.