MORE INFO:

Density refers to the amount of work you do within a given time. To find the density, multiply the weight you lift by the number of reps you perform. Rather than focusing on sets, reps or weight, perform as much work as possible in the amount of time you allot for your workout.

Density training workouts can take many forms, but they typically involve supersets or circuits to increase the amount of weight you actually lift, combined with limited recovery periods. An example of density training is Alan Stein’s “60,000 pounds in 60 minutes” workout. Your goal is to lift 60,000 pounds, no matter how you get there.

SOURCE:

https://www.stack.com/a/density-training/#:~:text=Density%20refers%20to%20the%20amount,you%20allot%20for%20your%20workout.