The interval technique known as Fartlek will keep things interesting (and improve your fitness). Fartlek training involves running at different speeds for intervals, but that’s kind of where the ...

Fartleks are an informal version of interval training. To start fartlek training, head outside, warm up for a few minutes at whatever activity you most enjoy — whether it’s walking ...

If you’ve resolved to get more fit in 2025, you’re in luck, because almost any exercise will steer you toward that goal. But ...