What is HIIT, and does it burn fat?
Short, hard intervals are everywhere right now. Here is what HIIT actually does, what it does not, and how to use it without burning out.
HIIT stands for high-intensity interval training: short bursts of hard effort separated by short rests. Done well, it is one of the most time-efficient ways to improve fitness. Done badly, it is just exhausting. The difference is in how you use it.
How HIIT actually burns fat
HIIT burns calories during the session, and a little extra afterward as your body recovers (the so-called afterburn). That afterburn is real but modest, much smaller than the internet suggests. The bigger win is that HIIT improves your heart and lung fitness fast, and it preserves muscle better than long, slow cardio when you are eating in a deficit.
In plain terms: HIIT helps fat loss most as part of a plan, alongside strength training and sensible eating, not as a magic bullet on its own.
How to do it safely, especially after 30
- Start with 1 to 2 sessions a week. HIIT is demanding; more is not better.
- Choose low-impact tools. Rower, bike or sled spare your joints versus all-out sprints.
- Warm up properly. The injury risk in HIIT is going hard while cold.
- Keep the hard parts short. 20 to 40 seconds hard, equal or longer rest, repeat.
HIIT is a tool, not a religion. Used twice a week alongside strength work, it is brilliant. Used every day, it just makes you tired and sore.
Where coaching helps
If you have high blood pressure, a heart condition, or you are returning after a long break, intensity needs to be set carefully. This is exactly where a coach earns their keep: scaling the effort to your body, watching your form when you are tired, and knowing when to push and when to hold back.
At The Coach Gym, HIIT and hybrid (HYROX-style) conditioning are programmed one-on-one, so the intensity always fits the person in front of us.
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