Mesocycle training: how long a training block lasts and how to plan one

Mesocycle, microcycle and macrocycle in numbers

A mesocycle is a training block of several weeks, usually 4-8, with one goal; in the gym, "mesocycle" and "training block" mean the same thing.

Microcycle: one week of training

A microcycle is the shortest repeating unit of a plan, in the gym usually one week of training (Evans 2019). When your sessions don't fit into a week, e.g. A and B alternating every other day, one full rotation is the microcycle.

Macrocycle: the plan for a year

A macrocycle is the whole plan for a season, made of several mesocycles; in the Evans 2019 review it usually lasts a year. If you don't compete, you simply line up blocks and between them change what isn't improving: in the chart above, the second block gives the stalled muscle group 2 more sets, and the third is a strength block with sets of 4-6 reps. How to order blocks toward one goal is covered on the training periodization page.

Why split training into blocks

A plan split into blocks doesn't build more muscle than a plan that stays the same: in a meta-analysis of 35 volume-equated studies, planned changes in weight and reps gave a little more strength but not more muscle (Moesgaard et al. 2022). Blocks give you a date to compare results and change the plan, and a place for a lighter week.

How to plan a training block step by step

You plan a block before the first session: the goal, the number of weeks, the starting sets and a lighter last week.

1. Pick one goal, e.g. muscle, strength in the three big lifts or a comeback after a break, and a block length from the table above; for your first block, take 6-8 weeks. With 10 or more sets per muscle group ending at RIR 0-1, take a shorter block, 4-6 weeks.
2. Count your starting sets: the weekly average per muscle group from the last 4 weeks of your log (without a log, 6-8 sets per muscle group). For a regular muscle group, keep that number if it falls within 4-10 sets (MEV); give a priority muscle group 2-4 more sets, toward 12-18 (MAV). If you already do more and your numbers are going up, stay there. You can check the week in the volume calculator.
3. Make week 1 a calibration week with RIR 1 higher: with RIR 2 in the plan, pick a weight that leaves 3 reps. You can work out the starting weight in the 1RM calculator.
4. Until the second-to-last week, add reps first, then weight (double progression), with the same number of sets. During the block, add 2 sets only to a muscle group that has stalled for 3 weeks even though you end its sets at RIR 1-2 and recover well.
5. Plan the last week as a deload: about 60% of the sets (4 sets become 2, 3 become 2), each ending at RIR 4. The weight stays as in the last regular week, and in a block with rising %1RM it goes back to week 1. Deload earlier only if signs of fatigue show up.
6. After the block, compare your estimated 1RM from week 2 and from the second-to-last week, counting reps plus RIR (1RM calculator). If it went up, calculate the weights for the next block from the last regular week, not from the deload. If a muscle group stalled all block on hard sets, give it 2 more sets in the next block (up to 20) or change the exercise or rep range; if the sets were easy, first end them closer to failure.

Some coaches lower RIR over a hypertrophy block, e.g. 3, 2, 2, 1, 1 and a deload; we know of no studies comparing this with a constant RIR. In a hypertrophy block we keep RIR constant from week 2 to the second-to-last week, because then every extra rep in your log means progress; in a block with rising %1RM, the reserve shrinks week by week by design.

Strength and physique coaches usually take a lighter week every 4-6 weeks, most often at the end of a mesocycle (Bell et al. 2023). We put the deload at the end of the block because that's where fatigue peaks, and right after it you start a new block. In a study with a week off in the middle of 9 weeks, muscle growth was no greater and strength went up less (Coleman et al. 2024). These studies don't test how many sets to keep in a deload; 60% of the sets at RIR 4 is our practice.

In trained lifters, a set count of 1.2 times what each person had been doing before the study, taken from their training log, gave more muscle growth than a standard 22 sets (Scarpelli et al. 2022). Adding 4 or 6 sets for legs every 2 weeks gave more squat strength than a constant set count, and the difference in muscle was small at most (Enes et al. 2024). You raise strength faster with weight than with another set: the 2026 ACSM position stand links strength gains to loads of 80% 1RM or more in 2-3 sets.

Hypertrophy and strength blocks in kilograms

A strength block is shorter than a hypertrophy block, and in both the last week is lighter.

For your 1RM, use a test result from a few weeks back or an estimated 1RM from a set at RIR 1-2 (1RM calculator). If the third set in W3 ends with nothing left, do 3 reps on the fourth.

Mesocycle vs block periodization and a plan without blocks

A mesocycle is any block of several weeks in a plan, and block periodization is one way of arranging several blocks in a row.

Common mistakes

1. A block with no set number of weeks. After your first year, a block without a written length gives you no date to compare results and no place for a lighter week. Enter the number of weeks and the deload week before the first session; in your first year, a steady week with progression is enough.
2. New exercises mid-block. Even a different machine for the same movement is a new starting point, because the same number on the stack of another model is a different resistance. Coaches bring in new exercises with a new mesocycle (Bell et al. 2023), so change them between blocks. The exception is pain: then swap the exercise right away and start progression from scratch for that one exercise only.
3. Sets with no upper limit. Each extra set gives less, and for strength the drop-off is steeper (Pelland et al. 2025). Stop adding sets at 20 a week (the top of MAV) and keep progressing with weight and reps.
4. Everything up at once. When the weight goes up, sets are added and RIR drops in the same week, fatigue rises faster than performance. Change one thing from week to week: reps, weight or the number of sets.

What the research says

What we know about mesocycles comes mostly from definitions, coach consensus and surveys, so certainty is low. You often read that every block must end with a deload; comparisons are very few, and 65% of athletes thought they would progress without one.

The best block length is unknown. In a 2017 review, no study tested when the effects planned in periodization arrive, and none lasted longer than 9 months (Afonso et al. 2017).

What plans built in SmartWorkout show

So blocks from the creator usually have as many weeks as coaches suggest, but fewer than one in ten has a lighter last week. If you want a deload at the end of a block, put it in when you plan. Every number is based on at least 50 people.

How to plan a mesocycle in SmartWorkout

You plan a mesocycle in SmartWorkout in the plan creator, where each block is a tab with weeks.

1. On the Workout tab, next to “My Plans”, tap “See All”, then “+” and “Create new plan”. Enter a name in “Plan name”, and under “Select load indicator” choose RIR.
2. Tap “Add Block” and “Create mesocycle”. On the “Mesocycle Generator” screen, set “Number of units”, meaning sessions per week (1-6), and tap “Next”.
3. On the “Define Microcycle” screen, add exercises and sets to each session, pick the “Number of weeks” (2, 4, 6, 8, 10 or 12) and tap “Next”.
4. On the “Define Mesocycle” screen, each week has its own tab. The creator doesn't change the weight or sets on its own, so you set the calibration week and the deload from the steps above by hand, then tap “Save”.
5. Press and hold the block tab: “Edit Block Name” gives it a name, e.g. “Block 1: hypertrophy”, and “Clone” copies the whole block as the next mesocycle. Finally, tap “Save” in the plan creator.

With Premium, you see each muscle group's sets in every week of the plan against the volume zones, so you can tell right away whether the deload drops below your usual volume.

You can paste the first week of a block through plan import (“Import plan” in the same “+” menu, 10 AI credits) and build the following weeks in the creator by cloning the week.

DAY: Upper A- Barbell Bench Press | WU 2x5 | 3x6-10 RIR 3 | TEMPO 20X0 | REST 180- Barbell Bent Over Row | 3x6-10 RIR 3 | TEMPO 2010 | REST 150- Seated Dumbbell Shoulder Press | 3x8-12 RIR 3 | TEMPO 2010 | REST 120- Cable Lat Pulldown | 3x8-12 RIR 2 | TEMPO 2011 | REST 120- Cable Middle Chest Fly | 2x10-15 RIR 2 | TEMPO 2011 | REST 60

These are the first five exercises of the Upper A day from week 1, the calibration week, of the 4-day upper/lower plan. You can see several blocks in one plan in the free full body to split plan: 4 blocks of 2 weeks, each with a different training split.

The help article on the plan creator explains how blocks, weeks and the mesocycle generator work.