You’ve been reaching for the same dumbbells for a few weeks now. You can finish your sets, the exercises feel familiar, and you’re starting to wonder whether it’s time to move along the rack. But the next pair looks like quite a jump.
Knowing when to increase the weight can be surprisingly awkward. Stay where you are and you worry about wasting your time. Go heavier too soon and the exercise suddenly involves considerably more swinging than you intended.
A useful starting point is to increase the weight when you can consistently complete the top of your planned rep range with good technique and some effort left. Here’s how to put that into practice.
Give Yourself A Rep Range
It’s difficult to judge whether you’re ready for more weight if you haven’t decided what you’re trying to do with the current one.
For example, you might plan three sets of eight to twelve repetitions. Eight to twelve isn’t a magic range, but it gives you a straightforward way to organise your progress.
Initially, you might manage ten reps in the first set, nine in the second and eight in the third. Over subsequent sessions, you work towards twelve in each set while keeping the movement controlled.
Once you can do that reliably, there’s a clear reason to consider a heavier weight. Simply reaching twelve on your first set doesn’t necessarily mean you’re ready if the remaining sets fall well short.
Adding repetitions is progress too. An eight-week study comparing increases in weight with increases in repetitions found that both approaches could improve muscular adaptations. You don’t have to move up the rack every session for your training to be worthwhile.
Check How Those Final Reps Feel
The number you reach only tells part of the story.
Twelve controlled reps with another couple probably available is different from twelve reps where the last three involve shortening the movement and throwing your body into it.
Before increasing, ask yourself:
- Am I using the intended range of movement?
- Can I control the weight throughout the exercise?
- Am I completing the reps without extra swinging or assistance?
- Could I manage another clean rep or two if necessary?
That last question is a rough way to judge your “reps in reserve”. You won’t always estimate it perfectly, especially as a beginner, but it encourages you to consider effort alongside the number in your notebook.
You also don’t need to prove readiness by taking every set to complete failure. The American College of Sports Medicine’s updated guidance says training to failure does not consistently improve outcomes for the average healthy adult.
Make Sure You Can Repeat It
One particularly good session is encouraging, but it doesn’t have to trigger an immediate increase.
A practical approach is to repeat your target across two sessions before moving up. Keep the exercise, technique and rest periods reasonably consistent so you’re comparing similar performances.
Using the three sets of eight to twelve example, your training log might look like this:
- First session: 12, 11, 10. Keep the same weight.
- Later session: 12, 12, 12, with a little left. Repeat the weight next time.
- Following session: 12, 12, 12 again with similar control. Try a small increase.
This is one workable progression method, rather than a rule every programme must follow. If you’re following a structured plan with its own progression instructions, use those.
Writing down your sets makes the decision much easier. Memory has a habit of remembering the impressive first set and quietly forgetting the other two.
How Much Weight Should You Add?
Start with a small increase that lets you stay within your planned rep range.
For context, ACSM’s earlier progression guidance suggested increases of around 2–10% once someone could exceed their target by one or two repetitions. That’s a broad guideline, and the equipment available won’t always allow a neat percentage.
Adding 2kg to a 40kg lift is a 5% increase. Moving from a 6kg dumbbell to an 8kg one is roughly a 33% increase. Both involve another 2kg, but they’re very different steps.
After increasing, expect to complete fewer reps. If you previously managed twelve and now manage eight or nine with good control, that fits the example range perfectly well. You can build the repetitions back up from there.
If you can only manage four awkward reps, choose a smaller increase or return to the previous weight for now.
What If The Next Weight Is Too Heavy?
This is common with smaller dumbbells and machines with large gaps between settings.
Check whether your gym has intermediate dumbbells, smaller plates or manufacturer-approved add-on weights for its machines. Ask a member of staff if you’re unsure what’s available.
If there’s no smaller step, you can continue building repetitions at the current weight, temporarily widening your rep range. Keep recording what you do so the sessions still have a clear target.
There’s no need to force the heavier option just because it’s the next one on the rack. Equally, changing your technique to move it makes it harder to judge whether you’ve actually improved at the exercise.
You Don’t Need A New Weight Every Week
There’s no universal timetable for increasing your weights, and each exercise deserves its own decision. Being ready to progress your leg press doesn’t mean your shoulder press has to follow.
Judge the increase against the task you’ve set yourself: the planned repetitions, consistent technique and an appropriate level of effort. If you’re still working towards those targets, keep practising at the current weight.
When you can meet them reliably, try the smallest sensible increase and see how it goes. Your training log should give you a reason to move up, rather than leaving you to guess when you arrive at the dumbbell rack.