Stop Chasing the Burn: The Science of HIIT Training That Actually Works
By Remi — You don't need a meal plan. You need someone who actually explains why. ·
The HIIT Obsession
It’s September 2026. The kids are back in school, the air in Toronto is starting to get that crisp, post-summer bite, and the gyms are packed with people frantically trying to 'undo' their summer. And what’s the number one thing I see on every floor? Everyone is sprinting, jumping, and gasping for air like their lives depend on it, chasing that elusive 'HIIT burn.'
Look, I get it. High-Intensity Interval Training (HIIT) is marketed as the ultimate shortcut. The promise is simple: burn maximum calories in minimum time. But here is the problem: most of you are doing it wrong, and more importantly, you’re doing it for the wrong reasons.
Growing up in a Haitian-Canadian home, food and movement were always about connection and longevity, not punishment. When I see people treating their bodies like a furnace to be stoked until it collapses, it breaks my heart. You don’t need to be broken to be fit. You just need to understand the mechanism.
Understanding the Physiology (The 'Why')
HIIT isn't a magic spell for fat loss; it’s a specific metabolic stressor. When you perform HIIT, you are pushing your heart rate into the anaerobic zone—that point where your body can no longer keep up with the oxygen demand.
This triggers something called EPOC (Excess Post-exercise Oxygen Consumption). Yes, this means your body continues to burn calories after the workout as it works to return to a state of homeostasis. But here is the catch: that 'afterburn' is often vastly overstated in fitness marketing. If you are doing HIIT five days a week, you aren't training; you’re just accumulating systemic fatigue. You are essentially redlining a car engine that needs an oil change.
The 'More is Better' Trap
One of the biggest misconceptions I hear from my clients is, 'Remi, if I’m not dripping in sweat and unable to speak for 30 minutes, did I even work out?'
If your goal is to build a body that serves you for the next 40 years, HIIT is a tool, not a lifestyle. When you overdo high-intensity work, you spike your cortisol levels. High, chronic cortisol is the enemy of the exact body composition goals most of you are chasing. It interferes with sleep, increases hunger signals, and makes it harder for your body to prioritize muscle protein synthesis.
In my practice, I treat HIIT like salt in a recipe. A little bit adds flavor and depth to your training program. A whole cup? You’ve ruined the meal.
How to Program HIIT Without Burning Out
If you want to incorporate HIIT into your routine, let’s do it with intention. Here is how I structure it for my amateur athletes and busy professionals:
1. The 1:2 Rule: For every minute of high intensity (near-max effort), take two minutes of low-intensity recovery. If you’re pushing at 90% capacity, your heart needs that recovery time to flush out lactate and actually prepare for the next set. If you don't recover, the intensity drops, and you’re no longer doing HIIT—you’re just doing 'kind of hard' steady-state cardio.
2. Frequency Cap: Limit your sessions to one or two times per week, maximum. The rest of your week should be dedicated to foundational resistance training and low-intensity steady-state cardio (like walking). Yes, walking. It’s the most underrated tool in your arsenal.
3. Choose the Right Tool: I prefer low-impact modalities for HIIT, like the stationary bike or the rower. When you do high-impact jumping exercises (burpees, box jumps) at high intensities when you’re already fatigued, your form breaks down. That’s how injuries happen. Keep the impact low so the intensity can stay high.
Listen to Your Biology
I’m not anti-HIIT. I’m anti-mindless-suffering. Your body is a complex, beautiful machine, not a calorie-burning calculator. It responds to stress, but it thrives on recovery. If you’re coming home from a HIIT session feeling like you’ve been hit by a bus every single time, you aren't building fitness; you’re digging a hole.
Instead of chasing the burn, chase the adaptation. Are you getting stronger? Is your resting heart rate improving? Do you have more energy to play with your kids or get through your workday? Those are the metrics that actually matter.
Remember, the best workout is the one you can sustain for decades, not the one that leaves you unable to walk down the stairs the next morning. Treat your body with the same care you’d put into a family meal—slow, steady, and full of intention.
So, what’s your current relationship with HIIT? Are you using it to challenge your heart, or are you using it to punish your body? Drop a comment below or shoot me a message—let’s talk about how to make your movement count. I’m here to help you figure out the 'why,' not just the 'what.'