Strength

Progressive overload: how much weight to add and when

Progressive overload means asking your body for a little more than it did last time, gradually, so training stays a challenge. Each session it comes down to one question: what should I lift next? Here is how people commonly answer it, and how Fortior suggests your next weight.

Updated October 24, 2026

What progressive overload means

"More" can take several forms:

• more weight for the same reps,
• more reps with the same weight,
• more sets, or
• the same work done with better control or a fuller range of motion.

Progress is rarely a straight line. Gains tend to come in smaller steps as training experience grows, so small, repeatable increases are normal.

How much weight to add

There is no single right amount. A common, simple method is double progression. Pick a rep range and a target effort. Add reps until every set reaches the top of the range at that effort. Then add the smallest available weight and start the range again from the bottom.

Example: three sets of a cable row, a range of 8 to 12 reps, aiming for about 2 reps in reserve.

Many coaches add weight only when the last session finished at or easier than its planned effort, and take the smallest step the equipment allows. If a set came in much harder than planned, holding the weight for another session is a common choice. Fortior's suggestions land on steps you can actually load: 2.5 kg (5 lb) for barbells, dumbbells and cables, and 5 kg (10 lb) for machines.

How Fortior suggests your next weight

Fortior works from your own recent sets, then shows its reasoning. The steps are always the same:

1. Start from your recent sets of that lift. Completed sets give an estimated max for the exercise. History older than a year is not used.
2. Take the planned reps and reps in reserve. They come from your program or template. If nothing else is set, the default target is 2 reps in reserve.
3. Work backward from the estimate. Fortior asks how heavy a set of those reps at that effort should be, given your estimated max. The same estimate gives a heavier weight for 5 reps than for 12.
4. Allow a small readiness adjustment. When Fortior has recovery or training-load data, it can move the weight by at most 5% either way. With little data, today's readiness changes nothing.
5. Round to a weight you can load. The result is rounded once, in your own unit. If the math lands on 134 lb, a barbell suggestion shows 135 lb and a machine suggestion shows 130 lb.

Sets you flagged for pain or form breakdown are not used, and very high-rep sets are not either. A blank reps in reserve counts as 2, never as failure.

When Fortior has little to go on

• No set in the planned rep range. If your recent sets were at other rep counts, the Previous row reads "Estimated from" followed by the set it used, for example "Estimated from 115 lb × 10", with its date.
• No usable history. The Previous row reads "No comparable set yet". Fortior then starts from related lifts you have done, or from a conservative beginner load scaled to your bodyweight when it can.
• Old or sparse history. Related lifts can fill in, and the recommendation says so, for example "Mostly your recent Leg Press sets, with your Back Squat filling in". The more you log the lift itself, the less the others count.

Starting estimates usually carry a low-confidence label. Confirm or adjust them as you train.

Using a suggestion well

• Treat it as a starting point. Adjust when a set is clearly too light or too heavy.
• Log what you actually did, with reps in reserve. The next suggestion updates from it.
• Ask why. Tap the recommendation to open "Why this weight?", which shows the target, how it was chosen and a confidence level. With AI on, Fortior AI can explain the target. It does not change it.
• Watch for stalls. If sets keep coming in harder than planned, adding weight may not be the answer. See deloads and rating your effort.

Weight suggestions are estimates based on your own logs, not a guarantee. Adjust the load to how you feel on the day. Fortior is not medical advice.