Adelaide: Your alarm goes off. Somehow, you manage to get dressed, drag yourself to the gym, and start squatting.

But why does it feel so hard? Your legs are heavy and the weight you lifted only a couple of days ago – in the afternoon – feels almost impossible.

No, you’re not imagining it. There’s a large body of evidence to suggest most of us are stronger, more powerful, and have better endurance later in the day.

There are several reasons exercising can feel much harder first thing in the morning. Here’s why, and how you can adjust to morning exercise if you need to.

Your circadian rhythm affects your workout

Your body has a natural 24-hour clock that regulates hormones, body temperature and when you feel most awake or ready for sleep.

This clock is called your circadian rhythm. It

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