HIIT for beginners: 20 minutes, by Cleveland Clinic guidance

Is 30 minutes a day too much for exercise? For many people the answer is yes, which is why HIIT (high intensity interval training) has become a shortcut that has reached Serbian living rooms and gym terraces alike.

Short bursts of maximum effort, alternated with rest, pack into 20 minutes the same effect that would otherwise take 45 minutes of moderate activity.

What Cleveland Clinic doctors advise

Doctors at the Cleveland Clinic have, in recent months, reminded the public that HIIT is not a passing trend but a method with solid clinical backing. The workout pushes the pulse above 80 per cent of maximum during short intervals, so the body continues to burn energy after the session ends, the so-called EPOC effect.

Cleveland Clinic notes that HIIT is effective for fat loss, cardiovascular strength and blood-sugar regulation. The downside is that the intensity is not suitable for everyone.

Short high-intensity intervals deliver cardiovascular benefits comparable to twice as long a moderate-intensity workout, but they require proper preparation and a gradual build-up.

Two or three sessions a week is the upper limit Cleveland Clinic recommends, with at least 48 hours of rest between sessions.

Who should not start without a doctor

Before the first session, ask your GP for the green light if you:

• have raised blood pressure or a diagnosed heart condition
• are pregnant or within six months of giving birth
• have a diagnosed knee, hip or spine condition
• are over 55 and have not exercised in the past five years
• had a moderate or severe Covid case in the past three months

A doctor will often ask for a resting ECG or a stress test before clearing you.

What the first month looks like for a beginner

The first four sessions are pure mapping of the terrain. The goal is not performance, but to teach the body the work-rest pattern.

• Week 1. Two sessions, 15 minutes each. Ratio of 20 seconds of work and 40 seconds of rest, five exercises in a circuit, three circuits.
• Week 2. Two sessions of 18 minutes. Same ratio, but four circuits instead of three.
• Week 3. Three sessions of 18 minutes. Ratio of 30 seconds of work and 30 seconds of rest if you feel ready.
• Week 4. Three sessions of 20 minutes. Ratio of 40 seconds of work and 20 seconds of rest, but only on movements you can perform safely.

Five basic exercises for the first month, no equipment needed:

• bodyweight squat
• reverse lunge with alternating legs
• press-up on knees, or full press-up if technique allows
• glute bridge from the floor
• high knees in place

A practical note before you start

Five minutes of warm-up are non-negotiable, arm circles, a light jog in place and dynamic hip stretches. Without it, the injury risk multiplies several times over.

Build the habit of tracking your pulse with a basic wristband or watch. The target peak during intervals is roughly 170 minus your age, with a recovery drop below 130 during rest.

The golden middle rule: if after the session you cannot say a full sentence without breaking for breath, the intensity is too high.

Prices of HIIT classes in Serbia, 2026

• Group HIIT class at a gym, 600 to 1,200 dinars, around 5 to 10 euros per session
• Boutique studio (Belgrade, Novi Sad), 1,500 to 2,500 dinars, around 13 to 21 euros
• Unlimited monthly pass, 4,500 to 7,500 dinars, around 38 to 64 euros
• One-to-one personal trainer, 3,000 to 5,500 dinars, around 26 to 47 euros per session
• Online platforms with recorded sessions, 800 to 2,500 dinars a month, around 7 to 21 euros

Online is a good option for weeks of travel, but the first month is best spent under a trainer who can correct your squat and lunge.

Is HIIT already part of your weekly routine, or does the intensity put you off? Tell us in the comments what the biggest barrier has been.