The strength training vs HIIT debate has been going on for years. Walk into any gym in Naperville or across the western suburbs of Chicago and you'll find strong opinions on both sides. But what does the actual research say heading into 2026?
Spoiler: both work. The real question is which one works better for you.
The Calorie Burn Myth
HIIT has long been marketed as the superior fat-burner, and there's something to that — during a session, HIIT does torch more calories per minute than a comparable strength workout. A 2023 meta-analysis in the Journal of Strength and Conditioning Research confirmed HIIT produces higher acute calorie expenditure.
But here's the part that often gets left out: strength training creates a meaningful "afterburn" effect (technically called excess post-exercise oxygen consumption, or EPOC) that can elevate your metabolism for 24–72 hours after lifting. Over the course of a week, the gap between the two narrows considerably.
Neither format is a magic calorie-burning machine. Both beat sitting on the couch.
Building Muscle: Strength Wins, But HIIT Is No Slouch
This one is less contested. Progressive resistance training is the gold standard for hypertrophy — that's muscle growth, for anyone who didn't go deep on fitness podcasts in 2024. A 2024 review in Sports Medicine found that structured strength programs consistently outperform HIIT for lean mass gains, especially in adults over 40.
That said, HIIT workouts that incorporate resistance elements (think kettlebell circuits or bodyweight intervals) do produce modest muscle-building results. If you're newer to exercise, you'll likely see strength improvements from almost any format in the early months.
Injury Rates: The Data Might Surprise You
HIIT gets a reputation for being rough on the body, and there's some data behind that. A 2022 study published in BMJ Open Sport & Exercise Medicine found injury rates in high-intensity interval programs running around 2.5 injuries per 1,000 hours of training — similar to recreational running.
Strength training, when programmed correctly, comes in lower — roughly 1–2 injuries per 1,000 hours in most longitudinal studies. The keyword there is "programmed correctly." Bad form under load is how people get hurt, full stop.
The takeaway: neither format is inherently dangerous. Coaching quality and programming matter far more than the format label on the door.
Time Efficiency: HIIT's Biggest Advantage
This is where HIIT genuinely shines. A well-designed 20–30 minute HIIT session can deliver cardiovascular and metabolic benefits comparable to a much longer moderate-intensity workout. A landmark study from McMaster University showed that 10 minutes of intense interval work (including warm-up and cool-down) produced similar aerobic adaptations to 50 minutes of steady-state cardio over 12 weeks.
If your schedule is tight — and whose isn't — HIIT gives you a lot of physiological bang for your time. Strength training typically requires longer sessions to hit all your major muscle groups effectively, though 45-minute full-body programs are absolutely doable.
Who Each Format Is Best For
Strength training tends to work well if you:
- Want to build noticeable muscle over time
- Are over 40 and focused on long-term bone density and metabolic health
- Prefer a lower-impact option that's easier on your joints
- Like measurable progress (adding weight to the bar is satisfying)
HIIT tends to work well if you:
- Have limited time and want an efficient, complete workout
- Enjoy high energy, group settings, and variety
- Want to improve cardiovascular fitness quickly
- Get bored doing the same thing twice
Where to Try Both in the Western Suburbs
If you want to explore strength training, the good news is that well-equipped gyms are all over the area. Planet Fitness Naperville is a solid, low-pressure starting point — 4.7 stars across over 1,400 reviews, beginner-friendly, and easy on the wallet. Planet Fitness Plainfield earns a 4.8-star rating and has the same accessible vibe. For a fuller club experience, Midtown Athletic Club Chicago brings a more premium setup with 4.3 stars from over 800 reviewers.
For HIIT, the western suburbs Chicago area has 50 dedicated HIIT studios averaging an impressive 4.7 stars. General fitness facilities like VASA Fitness Joliet and Chicago Sports & Fitness Club in Joliet also run group interval programs alongside their broader offerings. If you want class variety under one roof, several LA Fitness locations across the area include Studio Group Training and additional formats worth checking out.
And honestly? A lot of people in Naperville and surrounding towns do both — lifting two or three days a week and hitting a HIIT class on the others. The research supports that approach as well as anything.
The Bottom Line
There's no loser in this comparison. Strength training builds muscle and supports long-term health in ways HIIT can't fully replicate. HIIT delivers cardiovascular efficiency and time savings that are genuinely hard to match. The best workout is the one you actually show up for consistently.
Pick the format that fits your schedule, your goals, and your personality — then find a studio in the area that makes you want to come back.
Ready to explore your options? Browse all strength training studios and HIIT studios across the western suburbs on SweatLocal, or head to the homepage to search by city.