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As a personal trainer, I know the value of working out to (loud) music. But when I'm training for a lifting competition or a race, I switch off my headphones — without the external motivation of a thumping bass, you'll have to dig deep to rack up those miles.
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Changing your wardrobe can give your run the extra kick it needs. If your wallet can handle it, grab yourself a new running jacket or even new kicks. Running low on funds? Arrange a socially-distant clothing swap (post-laundry, of course) with a running buddy.
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"Fartlek" is a silly word (it means "speed play" in Swedish), and it'll bring some much-needed creativity to your routine. Pick a landmark — that tree, that stop sign. Sprint to it. Then walk until you pass that big rock. Choose a new landmark and start again.
Tempo runs aren't easy, but they'll definitely keep you focused. After a warm-up jog, go at a full effort for three minutes, a mile, two miles... whatever you choose. Keep track of your time and effort. Repeat in a few weeks to see how you've improved.