What the Heck is a Deload?
Plain and simple, a deload is a short planned period of recovery. You take your training slightly lighter, maybe workout a little less, and generally just ease things back. A typical deload will last a week.
To the uninitiated outsider, deloads seem like a waste of time or an excuse to sit on your butt for a week, watching TV instead of hitting the gym and shifting some heavy lumps of iron.
Not so fast.
Source: Fitness Life Nutrition