Want lean abs? Here are 4 rules to live by…

1. Minimise intake of sugar and quick-release carbs, which excite fat-storing hormone insulin

2. Reduce stress, which promotes cortisol, linked to abdominal fat storage

3. Get eight hours’ sleep per night to keep appetite hormones on the level 
(the no-doughnut level, that is)

4. Reduce overall body fat with heavy lifting and interval training

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