6/12/24 trisets involve doing three exercises with a heavy, moderate, and light weight. This is an intense training method designed to exhaust all types of muscle fiber.
For example:
Squats x 6 reps
Leg press x 12 reps
Leg extensions x 24 reps
On paper, 6/12/24 trisets are a fantastic workout, but, in reality, they’re hard to manage. Because of increasing fatigue levels, it’s almost impossible to determine the exact weights you need to use.
As such, the chances of doing precisely 6, 12, and 24 reps are very slim. A better option would be to use heavy, moderate, and light weights, taking each exercise to failure and without getting hung up on the exact number of reps.