What Les Mills Pump Actually Is

Les Mills Pump is a 45-minute group fitness class built around circuits of compound upper-body, lower-body, and core exercises performed with light dumbbells and your own body weight. Each B-program (B1 through B8, currently on B35) comes with a set choreography and specific exercise selection that repeats across an 8-week cycle. The workouts are designed so you push through a set number of reps per circuit before moving on, with very short rest intervals between blocks. That structure is what makes the 90 Day Challenge feasible — you're not starting from scratch every time, you're progressively overloading within a known framework. The challenge itself is straightforward: commit to doing Pump at least three times per week for 90 consecutive days. Most people treat it as a general fitness reset, which is fine, but the real value comes from tracking your reps or weight week over week and noticing which exercises are sticking and which aren't.

Les Mills Pump 90 Day Challenge Guide

Here's how I actually run it, based on what works and what falls apart if you just wing it. 1. Pick your current B-program and stick with it for the full 8-week run before switching. 2. Commit to a minimum of 3 sessions per week. More is fine, but going to 5 or 6 without taking deload weeks is how people blow out their elbows and shoulders by day 45.

3. Track your working weight. If you finish a 12-rep circuit and could have done 3 more, that dumbbell is too light. If you're failing at 8 reps, it's too heavy. There's a narrow sweet spot and you'll find it within the first two weeks. 4. Log something. A note in your phone, a spreadsheet, whatever. Without data, the 90 days just becomes a vague memory of being sore.

I learned the hard way that the "light weights, high reps" label is misleading if you take it literally. The weights aren't actually light — they're just lighter than what you'd use for straight sets. A 5kg dumbbell for tricep extensions can still tear your triceps up if you're doing 4 circuits of 12 reps with 20 seconds rest. I went too aggressive with my starting weight on B30 and spent a full week unable to overhead press due to triceps tendonitis. Workaround: drop the weight by 25% for the first two weeks, let your connective tissue catch up to your cardiovascular system, then start adding incrementally. Your tendons adapt much slower than your heart and lungs. That mismatch is why most people get hurt in these challenges.

The Progressive Overload Problem Most People Miss

The B-program structure doesn't automatically give you progressive overload across the 8 weeks. The choreography and rep schemes are fixed. What changes is the music, the cues, and occasionally one or two exercise substitutions. So if you just show up and do the session as written every time, you'll plateau around week 3 or 4 and then wonder why you're not seeing changes. The fix is manual progression. You introduce it yourself by manipulating variables the program doesn't touch:
  • Increase the working weight by 0.5–1kg on compound lifts (squats, lunges, chest press, rows) once you can complete all reps with clean form and have at least 2 reps left in reserve.
  • Reduce rest between circuits by 5–10 seconds. This is the easiest lever and the one most people ignore.
  • Slow the tempo on isolation movements. A 3-second lowering phase on bicep curls or lateral raises adds meaningful tension without needing heavier dumbbells.
I apply the rest-shortening method first because it costs nothing and compounds across all four circuits in a session. Dropping 10 seconds of rest per circuit in a 4-circuit workout saves you 40 seconds of total rest per session. Over 13 weeks, that's roughly 8 minutes of additional work time accumulated, which meaningfully shifts your conditioning.

What Happens Around Week 6

This is the breakpoint. The novelty is gone, your body has adapted to the movement patterns, and you're likely still using the same weights you started with. Some people quit here. Some people push through and then hit another wall around week 10. At week 6 I recommend a deliberate deload. Cut your volume in half — do two circuits instead of four, or drop the weight by 30% and focus purely on speed and form. One week of reduced load will reset your fatigue and make weeks 7 through 13 feel noticeably easier. It's counterintuitive to go lighter to get stronger, but it's the single most effective adjustment I've made across six different 90-day cycles.

Common Pitfalls

Skipping warm-ups to "save time." A Pump session without a proper warm-up is a fast track to shoulder impingement. The five-minute warm-up built into the class isn't optional fluff — it's specifically designed to prep the rotator cuff and hip flexors for the movement patterns ahead. Never skip it. Using the same weights for every exercise. Your legs need significantly more load than your shoulders. Treating the program as a one-weight-fits-all model means you're underloading your lower body and overloading your upper body. Pick separate dumbbells for push movements, pull movements, and lower-body work. Chasing three times a week by doing four or five when you're not recovered. This is the classic beginner mistake. More frequency without adequate recovery doesn't accelerate results — it extends them. If you're sleeping poorly, your resting heart rate is elevated, and your joints feel cranky, you're not building fitness, you're digging a hole. Take an extra rest day.

Where This Approach Falls Short

Pump will improve your muscular endurance, conditioning, and work capacity. It will make you look and feel better. It is not a maximal strength program. If your goal is to significantly increase your squat or deadlift numbers, this isn't the vehicle for that. You'd be better served by a dedicated barbell or kettlebell strength program three days a week and using Pump as supplemental cardio on off days. It's also not ideal for people with pre-existing shoulder issues. The overhead pressing and lateral raise patterns are repetitive enough that any underlying impingement or rotator cuff weakness will be amplified, not cured. I've seen this repeatedly. If you have shoulder pain that predates the challenge, address it first or choose a different modality.

Getting Started

Download the Les Mills+ app or use a subscription that includes Pump sessions. Pick the current B-program. Buy or borrow a pair of adjustable dumbbells or a set covering roughly 2kg to 8kg. Commit to three sessions per week for 90 days. Track your weights and how you feel each session. Deload at week 6. Add weight or reduce rest manually to keep progressing. That's it. Nothing magical about it. The program does the heavy lifting design-wise — your job is consistency and gradual escalation. Most people who finish 90 days are surprised by how much better they feel, and a surprising number of them want to keep going.