Training by feel: how autoregulation actually works

How to adjust load, reps and set count to your daily readiness using RPE and RIR, with concrete numbers, a three-question check and clear rules for deloading.

A plan written on paper does not know you slept five hours, carried boxes all afternoon, and that your shoulder has been nagging since yesterday. Autoregulation is one simple rule: you pick the load, reps and number of sets based on how your body works that day, but inside limits you set in advance. It is not improvisation — it is a plan with a range instead of a single fixed number.

What training by feel actually means

The feeling gets measured, not guessed. Two scales do the whole job:

RIR (reps in reserve) — how many more reps you could have done before failure. RIR 2 means you stopped two reps short.
RPE (rate of perceived exertion) from 6 to 10. RPE 10 = RIR 0, RPE 9 = RIR 1, RPE 8 = RIR 2, RPE 7 = RIR 3.

As a general rule, keep working sets for strength and muscle between RPE 7 and RPE 9. Below RPE 6 the stimulus is too small for most people, and RPE 10 on every set is a bill you pay over the next two to three weeks.

Picking the load for the day

Instead of "80 kg x 5 x 3", the plan says: one top set of 5 reps at RPE 8, then three sets with 10% less weight. Concretely:

Warm up: empty bar for 10 reps, then 50%, 70% and 85% of your estimated working weight for 3–5 reps each.
Top set: take the weight that felt like RPE 8 last week, do 5 reps, rate the effort.
If it came out at RPE 6–7, add 2.5–5 kg and repeat. If it came out at RPE 9–10, drop 5–7% and stay there.
Back-off sets: 3 sets of 5 with 10% less than the top set, each staying at RPE 8 or below.

The payoff runs both ways: on a good day you lift 5 kg more than a fixed plan would have allowed, and on a bad day you get three quality sets instead of three missed ones.

Autoregulating the number of sets

Volume follows the same logic. Track how reps drop between sets at the same weight and the same rest (2–3 minutes for compounds, 60–90 seconds for isolation).

First set 10 reps, second 9, third 8 — normal drop-off, keep going.
When reps fall by 20% or more compared to the first set (say from 10 down to 7), that exercise is done for the day.
Write ranges into the plan: "3 to 6 sets for back" instead of a fixed 5. Good day, you go to 6. Bad day, you stop at 3.

A readiness check before you train

Before you walk in, answer three questions and score each 1 to 3 (1 = bad, 3 = good): sleep quality, energy level, joint and muscle soreness.

8–9 points: normal session, aim for the top of your set range.
5–7 points: normal session, but top set at RPE 7 and the bottom of the set range.
3–4 points: two main lifts, 60–70% of usual weight, 20–25 minutes, then go home.

A resting heart rate 8–10 beats above your own average for several mornings in a row, combined with under 6 hours of sleep, is data — not an excuse. The same goes for food: in a 500 kcal daily deficit, expect the same kilos to feel about half an RPE point heavier.

The common mistakes

Using "by feel" as permission to skip. Autoregulation changes the load, not whether you train. The bottom of the range is still a session.
A poorly calibrated scale. Beginners often call something RPE 9 when they had 4–5 reps left. The fix: every two to three weeks, take one set to true failure on a safe movement (a machine or dumbbells) and compare the feeling.
Everything to failure. More than 2–3 failure sets per muscle group per week usually extends recovery, not results.
No log. If you do not write down weight, reps and RPE, you have nothing to compare next week against. Over a year that is thousands of reps with zero data.

How this fits the long-term plan

Autoregulation works inside a 4 to 6 week block, not instead of one. The block target still sits on paper: for example, "squat 5 reps, from 100 kg to 107.5 kg in six weeks". The daily feel only decides which road you take to that number.

If the same weight feels a full RPE point heavier two weeks in a row, that is not a bad day — that is a signal to back off.

A deload is one week at roughly 60% of your usual set count, with loads kept at RPE 6. After that, in most cases you return to your old numbers, and they move more easily than before.

When to see a doctor

Feel is a good tool for fatigue and a bad tool for diagnosis. Book an appointment if you have:

chest pain, shortness of breath or fainting during or after effort;
joint pain lasting more than 2–3 weeks or waking you at night;
tingling, numbness or weakness in an arm or leg;
a swollen joint, fever, or unexplained weight loss;
a resting heart rate persistently more than 10 beats above normal with no clear reason.

The short version

Keep working sets at RPE 7–9, meaning 1–3 reps in reserve; save RPE 10 for at most 2–3 sets per muscle group per week.
Instead of a fixed weight, plan a top set at RPE 8 plus back-off sets 10% lighter.
End an exercise when reps drop 20% below your first set.
Plan sets as a range (3–6, for example) and choose within it using a quick sleep, energy and soreness check.
Two consecutive weeks of decline means a week at 60% volume, not gritting your teeth.