Every December the fitness industry publishes predictions, and most of them are marketing. One is not. The American College of Sports Medicine has run its Worldwide Fitness Trends survey annually for 20 years, polling thousands of certified exercise professionals, and it publishes the ranked results in the ACSM’s Health and Fitness Journal. For 2026 the number one trend is wearable technology, which has now held the top spot nine times, more than any other item in the survey’s history.
Knowing the difference between that survey and a brand’s trend report saves you money.
what the survey actually measures
The ACSM list is a poll of practitioners. Respondents are trainers, coaches, and program directors, a majority holding an ACSM certification, and they rate potential trends on expected importance. That makes it a good read on what gyms are about to buy and staff. It is not a measurement of consumer behavior, and it is not evidence that any listed item works.
The 2026 list includes programming for older adults, exercise for weight management, mobile exercise apps, core and balance work, exercise for mental health, and traditional strength training. Notice what that collection tells you: the field keeps circling back to strength work and to serving people over 50. Those are not fashions. They are the parts of the market with real demand.
the wearable problem
Wearables win the survey year after year, and they also produce the single most misleading number in consumer fitness.
Shcherbina and colleagues at Stanford tested seven wrist worn devices in a 2017 study published in the Journal of Personalized Medicine. Heart rate held up well: six of seven devices measured it within an error rate of about 5 percent, and the best was near 2 percent. Energy expenditure was a different story. Not one device measured it acceptably. The most accurate was off by roughly 27 percent, the least accurate by more than 90 percent.
| Metric | How the devices performed |
|---|---|
| Heart rate | Six of seven within about 5 percent error |
| Energy expenditure | No device acceptable; best about 27 percent off, worst over 90 percent |
Practical translation: use the heart rate. Use the step count as a rough consistency check, since being off by 8 percent every day still tells you whether Tuesday beat Monday. Do not budget food against the calorie figure. A 27 percent error on a 600 calorie reading is 160 calories, which is most of a snack, every session, forever.
market size forecasts are not information
The old version of this discussion always cited a sportswear market projection, something like $126 billion by 2015 from a market research firm. Those figures get repeated for a decade after publication and almost never get checked against what happened.
Current estimates put the global athleisure segment somewhere above $420 billion for 2025, with forecasts to 2030 and beyond ranging from roughly $620 billion to nearly $900 billion depending on who is selling the report and how they define the category. When credible firms disagree by 40 percent on the same market in the same year, the precise number is not knowledge. It is a sales document with a decimal point.
The signal underneath is real and boring: people buy more technical athletic clothing than they used to, and they wear it outside the gym. You did not need a forecast for that.
where the clothing advice holds up
The old blog advice was to wear something you like and mix brands with cheap basics. That is fine, and there is a reasonable argument that it helps: if getting dressed is an obstacle, removing the obstacle raises the odds you go. I am skeptical of how far that goes. Nobody has shown that a nicer top improves training adherence, and the studies on exercise adherence point at scheduling, supervision, and proximity to the gym rather than gear.
Two things about gear do change performance measurably. Running shoes wear out, with most manufacturers and running labs putting midsole life somewhere between 300 and 500 miles, after which cushioning degrades. And a sports bra that fits reduces breast movement enough to affect comfort and, for some women, running mechanics. Those are worth money. A patterned tank is a preference, not an investment.
how to use a trend list
Read the ACSM ranking once a year, in about five minutes, for one purpose: to see what your gym is likely to add and whether any of it solves a problem you have. If balance and core programming is rising and you are 45 and never train either, that is a useful nudge. If wearable technology is number one again, it means the gym will try to sell you an app subscription.
Then ignore the rest. The things that determine whether you are fitter in a year are how many sessions you complete, whether you add load over time, and whether you sleep. None of those have ever appeared on a trend list, because nobody can sell them.