What is the Training Volume and Fatigue System? The definition in 20 seconds

The system splits your training into three sides. On the volume side sit the markers MV, MEV, MAV and MRV, counted in hard sets per muscle group per week. You steer the fatigue side through the SFR of your exercises and through set effort with RIR or RPE. The recovery side is described by the SRA model, and a planned deload resets the cycle.

• Volume: How many hard sets a muscle gets per week. Too few gives no stimulus, too many mostly gives fatigue.
• Fatigue and recovery: What each set costs you in recovery and how long it takes until your performance is back. Exercise choice and set effort decide how expensive your volume gets.
• For hardgainers this means: “More” is not the plan. The plan is the corridor between the lower and upper limit. Recovery costs energy, so with a tight surplus you often hit the limit sooner.

The anchors in the system: the deep dive on sets per muscle group, progressive overload and the Metabolism System.

Training volume and fatigue: the scale from MV to MRV

All volume markers sit on the same scale: hard sets per muscle group per week. From bottom to top:

• MV, maintenance: The smallest dose that keeps your muscle. It sits below MEV and is meant for phases when building is not the focus.
• MEV, the floor: This is where building starts. Our starting range for most muscle groups is 5 to 9 hard sets per week, a practice value, not a measured one.
• MAV, the working corridor: The range with the best ratio of stimulus to fatigue. Most of your training weeks belong here.
• MRV, the ceiling: The most volume you can still recover from. In one review, more than 20 weekly sets added nothing for the quadriceps and biceps compared with 12 to 20.
• Junk volume, possible anywhere: Sets that create fatigue but deliver little stimulus. Too easy, sloppy technique or above your ceiling.

More sets bring more growth on average, but the curve flattens. That is why you work in the corridor, not at the ceiling.

What you control and what you don't

Your markers are not fixed numbers. They shift with your setup. What you control are the levers that shift them.

• Set effort: Hard sets close to failure, usually with 1 to 3 reps in reserve. In a meta-analysis, training to muscular failure gave no advantage for muscle growth over training with reps in reserve. Many notice that constant failure mostly costs recovery.
• Exercise selection: Exercises with a good SFR put a lot of stimulus into the target muscle with little overall fatigue. That fits more productive volume into your budget. More on that under exercise selection.
• Distribution: You can spread the same weekly volume over one or several sessions per muscle. How often is covered by training frequency.
• Daily life and energy: Sleep, stress, daily movement like NEAT and your calorie budget often shift your ceiling more than two sets more or less.
• Not in your control: You do not decide where your MRV sits. You find it through the performance in your logbook.

Practice: the 14-day check

• Day 0, set your base: Count the hard sets per muscle group from last week, indirect work included, warm-up sets not. Lock in exercises, range of motion, frequency and RIR and keep them constant. If you are under 5 sets, start at 5 to 9.
• Log every session: Load, reps and RIR for your main lifts. Plus daily bodyweight, steps and your sleep on a scale of 1 to 10. A lot of daily movement draws on the same recovery as your training. How much your steps burn is shown by the NEAT Calculator.
• Day 14, check the trend: If performance rises at the same RIR, add one or two sets per muscle group. If it stalls although your sets are hard and sleep and calories are right, check the SFR of your exercises first. If it drops two weeks in a row, you were at your ceiling: cut sets or deload.

Two weeks show you the direction. You find your actual markers over several blocks, not in one test.

Common misconceptions

• “When I stall, I need more sets.” That is the reflex. Check sleep, calories and set effort first. More sets without more stimulus are just more fatigue.
• “Being tired proves the training works.” Fatigue is the price, not the result. The result shows up in your logbook: more load or more reps with clean technique.
• “I only need a deload when nothing works anymore.” By then it is too late. Plan it as part of the block. In a deload you mainly cut the number of sets, roughly in half, while exercises and routine stay.
• “The numbers from charts apply to me.” They are practice guidelines, not tested measurements. Your markers depend on training age, sleep, calories and exercise selection.

Common questions