A free place for trail and ultra runners to find friends training for the same race. Claim a handle, pin your race, follow people, and talk on the feed.

Yes. Free beta. Claim a handle and invite a friend.

Trail and ultrarunners with a race on the calendar. First 50. First hundred. Western States. Hardrock. Your local loop. If you want company around race day, you are in.

How is this different from Strava?

Strava is for your miles. pr.run is for friends in your race: who entered, what they pack, where they rehearse, and a tip when you need one.

Hit Join free, claim a handle, pin the race you entered, and follow a friend.

Your race, kit notes, routes, and pics on a public profile. The feed is for tips and thumbs, not a replay of every mile.

Do you connect to Strava?

Yes, when you want it. You approve the connect. The long run still lives on Strava.

Is this a training plan app?

No. Bring your own plan, coach, or gut. pr.run is where your people show up for the race on the calendar.

Which races are listed?

Flagship 50s, 100s, and 200s we could verify, plus hundreds more. Missing yours? Tell us and we add it.

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Drink mix

Build the bottle.

Formulate DIY sports drinks. Real-time osmolality, glucose:fructose ratio, and comparisons to commercial presets.

Safety

Test first

Osmolality estimates from idealized molecular weights.

Run the numbers

Course

Brand preset

Maltodextrin (25g)

Fructose (12g)

Salt (0.6g)

Volume

Gut-trained (fructose-adapted)

Carbs

45g

Ratio

1.8:1

Osmolality

hypotonic

Sodium

234mg

Up to 90g/hr with this ratio.

Pick a race to get course-specific next steps.

Loading calculator…

Course

Brand preset

Maltodextrin (25g)

Fructose (12g)

Salt (0.6g)

Volume

Gut-trained (fructose-adapted)

Carbs

45g

Ratio

1.8:1

Osmolality

hypotonic

Sodium

234mg

Up to 90g/hr with this ratio.

Pick a race to get course-specific next steps.

Sports Drink Mix Builder | PR Run