"Do more" can mean any of the following:
Higher volume--more sets, reps, or miles.
Higher intensity--heavier weights, faster rides or runs.
Higher frequency--the same thing more often.
Higher difficulty--more challenging lifts, incorporating hills into cardio training.
Source Citation (MLA 7th Edition)
Sculer, Lou. "REPROGRAM YOUR METABOLISM." Men's Health Mar. 2012: 108.