Heavy Duty Training (HD)

Heavy Duty is very similar to High Intensity Training (also known as ‘HIT’). HIT is based around performing very intense, brief and infrequent workouts. The goal is progressive overload: to add weight to the bar at every workout. Every set is taken to total failure.

A former professional bodybuilder named Mike Mentzer coined the term ‘Heavy Duty Training’. Essentially though, HDT and HIT are different names for the same thing.