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Only a few smartwatches have marathon training plans — so I found the best and worst options for my Garmin marathon

Brands like Garmin, Coros, Polar, Amazfit, and even Samsung want to help you run a marathon, but they have very different training plans.

I've reviewed pretty much every running watch under the sun, but whether I use my Garmin Forerunner 970 or another device, my success or failure will depend on the workout plan, more than the hardware. You can't simply choose a marathon training plan; if Samsung ranks you lower, you'll have to spend weeks, if not months, leveling up. With that, it generates a three-month program of easy, hard, interval, fartlek, and long runs, grouped by HR zones or pace depending on your preference.

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