How many times a week should a beginner do HIIT?
Starting something new usually comes with a burst of enthusiasm, and with HIIT that can be a problem. We regularly meet beginners who book five classes in their first week, feel wrecked by Thursday and quietly disappear. So here's the short answer on HIIT for beginners: start with two sessions a week, build to three over the first couple of months and leave at least a day between hard sessions.
The rest of this guide explains why, how to build up and what to watch for. If you haven't picked your first class yet, our first-timer's guide to HIIT classes in NW6 is a good place to start.
Why HIIT for beginners starts at two sessions a week
HIIT alternates maximum effort with short recovery. That intensity is what makes it effective and also what makes it demanding. Your heart and lungs adapt fairly quickly, but muscles, tendons and joints take longer. Two classes a week gives your body time to recover and adapt between sessions, which is when you actually get fitter.
It also sets you up to stay consistent. Two 45-minute classes are much easier to protect in a busy week than five. Three months of steady twice-weekly training will do far more for you than two frantic weeks followed by a month off. Our guide to building habits that stick goes into this in more detail.
How to build up over your first three months
This is roughly how we'd guide a new member. Everyone is different, so use it as a starting point and talk to your coach.
| Stage | HIIT classes a week | Other activity | Focus |
|---|---|---|---|
| Weeks 1 to 2 (Kickstart) | 2 | Walking on other days | Learning movements and finding your pace |
| Weeks 3 to 6 | 2 | Walking or easy cycling | Consistency and good technique |
| Weeks 7 to 10 | 2 to 3 | One easy session | Pushing harder in the work intervals |
| Month 3 onwards | 3 | Optional SGPT for strength | Steady progress and a routine you can keep |
Our memberships follow the same logic. You can start at one class a week for £45 per 28 days, move to two a week for £85, then three a week for £119, which is also our most popular option. The 2-week HIIT Kickstart(£39 for four classes and a goal-setting consultation) fits neatly into weeks one and two.
Once three classes a week feels comfortable, the next step usually isn't a fourth HIIT class. For most people, it's adding some strength work. Many members swap one HIIT session for Small Group Personal Training, which uses heavier weights at a slower pace and balances out the intensity of HIIT nicely.
Rest days matter more than you think
Rest days don't have to mean sitting on the sofa. A walk, a gentle bike ride or some mobility work all help. What you want to avoid is back-to-back maximum-effort days while you're new. Our coaches cover this in is HIIT safe every day?, but the gist is that more isn't always better.
The NHS guidelines for adults suggest 75 minutes of vigorous activity a week, or 150 minutes of moderate activity, plus strength work on at least two days. Two or three HIIT classes a week, with some walking, covers that comfortably.
Signs you're doing too much
- Soreness that's still there three or four days later.
- Sleep getting worse even though you're more tired.
- Your performance dropping from one week to the next.
- Small niggles in knees, shoulders or your lower back.
- Dreading classes you used to look forward to.
If two or more sound familiar, drop a session for a week and tell your coach. They'll scale the exercises, and every class has alternative movements so you can work at the right intensity.
What your first class looks like
You don't need to be fit to start, although a basic level of fitness helps. Classes are 45 minutes, fully coached and suitable for complete beginners. Bring comfortable clothes, water, a towel and a padlock for the lockers. If you're nervous about walking in, read our tips on overcoming gym anxiety. Most people find the first ten minutes are the hardest part.
Not sure where to start? Get in touch and we'll suggest the right classes from our timetable for your first fortnight.
Start HIIT for beginners the right way
Four coach-led classes over two weeks, a goal-setting consultation and technique guidance every session. Book your HIIT Kickstart for £39.
Enquire NowFAQ
Can a complete beginner do HIIT?
Yes. Our classes welcome all fitness levels, and coaches scale every exercise so you can work at a level that suits you.
Is it OK to do HIIT every day?
Not for beginners. Two to three sessions a week with recovery days in between is safer and gets better results.
How long until I see results?
Many members notice more energy and stamina within a few weeks, with body composition changes following as they stay consistent.
What should I bring to my first class?
Comfortable training clothes, a water bottle, a towel and a padlock if you'd like a locker.
