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5 ways your body changes by running

Running involves repeated muscle contractions, over and over again as you pound the pavement.

Shot of a young man tying his shoelaces before a run

One of the hidden benefits of running is how your muscles adapt to improve your performance, burn energy more efficiently and have improved recovery.

1. Slow is the way to go

Many thousands of muscle fibre cells are bundled together to form a working muscle. These individual muscle cells either contract fast or slow. The fast, known as fast-twitch muscle cells, are good for short sharp sprints, but soon lose power. Slow-twitch muscle cells contract slower, but have the amazing ability to be able to go on and on. Running builds slow-twitch muscle fibres that can keep on going.

2. Scintillating stem cells

Every time you run, small stem cells sitting close to the muscle fibres spring into action. In the hours after you finish, these stem cells rapidly grow, divide and mature. Within one to two days of your last run, the stem cells are working hard to replace unwanted fast-twitch muscle cells, and building and repairing the important slow-twitch muscle cells.

3. Maximising mitochondria

Deep within each muscle fibre are small powerhouses, known as mitochondria. With each session of running the mitochondria need to work harder to generate the energy required to sustain muscle contractions. These mitochondria adapt to running, not only getting bigger, but also dividing to generate many more microscopic powerhouses.

4. Burning fat

If you haven’t been running for a while, you’ll soon notice the pain of lactic acid building up in your muscles with even the mildest of exertion. The lactic acid is a sure sign your muscles are using glucose (sugar) as their major energy source.  Glucose is good for a short burst, but it will soon run out. Its better to use something most of us have plenty of – and that’s fat. Regular running trains muscles to switch from using glucose towards fat.

5. Recovery

Bad news; running produces free radicals. Good news; running also activates anti-oxidative enzymes that are so effective at mopping up free radicals that muscles are protected for days after each run.

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