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Movement · Personal training · Evidence graded

What Your Class Can’t See

Spin, Pilates, yoga and Peloton all have a place. Each one trains a slice of what your body can do. Here’s what tends to get left out, why it matters more after 40, and what one-to-one training adds.

Stephen Duncan FDN-P MSc · Detective Health · October 2026 · 8 min read

The grades in this post: Review or Meta-analysis means pooled studies; Small trials means supervised studies too small to settle it; My view means a coaching judgement built over decades, labelled as mine, not a trial result.

“I already do Pilates. Why would I need you?”

I hear some version of that question all the time. One client spins three times a week. Another has done Pilates for years. Another follows yoga on YouTube, and plenty of people have a Peloton in the spare room. None of it is a waste of time.

But when they tell me what’s bothering them, a stiff back, a knee that complains on the stairs, feeling less able to take life on, what they’re doing rarely sounds like the answer. I’ve spent nearly forty years working with people, starting in boxing and athletics coaching, then personal training, corrective exercise and nutrition. This is the gap I see most often: being active isn’t the same as being matched.

What classes get right

If you love your class, keep going.

Fitness in the round

Coaches talk about bio-motor abilities: the separate physical qualities that make up what your body can do.

They depend on each other. You can’t train power safely without strength underneath it, or agility without coordination and balance. My view, after a long time doing this: function comes from having the whole set, not from being very strong, very fit or very bendy at the expense of the rest. I try to cover all of them for every client, either in each session or across a series of sessions.

Each class format leans on one or two.

FormatWhat it trains wellWhat it mostly leaves out
Spin and Peloton bikeCardiovascular endurance, some leg power in sprintsStrength under real load, mobility, balance, anything off the bike or in other directions
Pilates (mat and reformer)Trunk control, hip stability, muscular endurance, body awarenessHeavy loading, power, landing and slowing down
YogaMobility, strength in held positions, balance, breathingProgressively heavier loading, power, pulling strength

My view This table is my coaching judgement, not a trial result. Classes vary a lot, and a good instructor will cover more than the format suggests. But the pattern holds often enough to be worth checking against your own week.

The problem comes when one format becomes your whole training. Then the slices it leaves out quietly fade, and those are often the ones that matter most as we age.

It’s the format, not the instructor

There are brilliant class instructors. The limit is what one-to-many teaching can do. A teacher in front of 20 people has to pick one plan for the room. They can’t change your load because your left knee is grumbling today, or stand beside you long enough to check you’re feeling the muscle you’re meant to. A screen can’t see you at all.

What one-to-one adds

I start from you rather than from a class plan, and adjust on the spot:

I also mix styles in one workout: a strength move, a mobility drill and a balance or reactive challenge in one superset. I coach whole-part-whole: try the whole movement, practise the part that’s letting it down, then put it back together. Here’s what that looks like in practice: Same Exercise, Different Animal.

Why it matters more after 40

Most of my clients are middle-aged. They want to move without pain, cope with what life throws at them, and keep doing what they enjoy for decades.

Power isn’t just “fast”

Doing exercises quickly with short rests isn’t power training. That’s power endurance, or just hard work. Power is a full-effort, quick action with enough recovery to make the next one just as sharp. The same goes for “pace”: to me, pacing means knowing your limits well enough to spread your effort over the task, not going as fast as you can.

Is it safe for older adults?

It depends on how you get there. Across 12 trials of jump and hop training in older adults (average ages 58 to 79), no study reported more injuries or other harm (Vetrovsky 2019). Small trials Small, supervised trials; no harm reported is not the same as proven safe.

In my experience, safety comes from:

Not for you yet, or only with care: if you have knee or hip pain on landing, problems with balance, osteoporosis, or you’ve been told to avoid impact. Hops and jumps come last, after landing practice. Check with your GP or physio first if you’re unsure.

And it isn’t for everyone. Some people would rather give me 60 seconds of a stretch than 30 seconds of real effort, and that’s their choice. I work with what each person brings.

Keep your class, fill the gaps

You don’t have to choose. Keep the spin class, the Pilates, the yoga, the Peloton. Just don’t assume they cover everything. A good trainer looks at what your routine gives you, works out what’s missing, and builds sessions around the gaps, your body and what you want to be able to do.

Sources

  1. Reid KF, Fielding RA. Skeletal muscle power: a critical determinant of physical functioning in older adults. Exerc Sport Sci Rev 2012;40(1):4–12. PMID 22016147. doi:10.1097/JES.0b013e31823b5f13
  2. Lopez P et al. Does high-velocity resistance exercise elicit greater physical function benefits than traditional resistance exercise in older adults? A network meta-analysis of 79 trials. J Gerontol A 2023;78(8):1471–1482. PMID 36378500. doi:10.1093/gerona/glac230
  3. Vetrovsky T et al. The efficacy and safety of lower-limb plyometric training in older adults: a systematic review. Sports Med 2019;49(1):113–131. PMID 30387072. doi:10.1007/s40279-018-1018-x

Your next step

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Nutrition, testing and movement from one practitioner, so the plan agrees with itself. I sell personal training and movement coaching, so I declare an interest: the article’s grades apply to it too.