Subreddits similar to r/running

7m subs

Discussion of physical fitness/exercise goals and how they can be achieved
https://reddit.com/r/Fitness/

30k subs

2m subs

A place for people of all sizes to discuss healthy and sustainable methods of weight loss. Whether you need to lose 2 lbs or 400 lbs, you are welcome here!
https://reddit.com/r/loseit/

r/xxfitness

358k subs

For women and gender non-binary redditors who are fit, want to be fit, like reading about fitness to put off getting fit. Feel free to discuss your own personal experience related to fitness, exercise, dieting, gaining weight, body image, and health.
https://reddit.com/r/xxfitness/

r/bicycling

507k subs

Two wheels, powered by a person. Interested in riding a bicycle? We welcome bicyclists of all skill levels including those who don't yet own a bike. Ask us your questions or meetup with other redditors in your area for local rides. Happy cycling!
https://reddit.com/r/bicycling/

r/C25K

94k subs

Anything related to the [Couch to 5k](http://www.coolrunning.com/engine/2/2_3/181.shtml) running programs or the like; open to all, noobie to pro.
https://reddit.com/r/C25K/

r/fffffffuuuuuuuuuuuu

857k subs

it's still alive! kinda...
https://reddit.com/r/fffffffuuuuuuuuuuuu/

r/malefashionadvice

2m subs

Making clothing less intimidating and helping you develop your own style. We welcome those who want to learn and those who want to contribute.
https://reddit.com/r/malefashionadvice/

r/reddit.com

818k subs

The original subreddit, now archived.
https://reddit.com/r/reddit.com/

r/trailrunning

40k subs

The fun begins where the road ends.
https://reddit.com/r/trailrunning/

r/AdviceAnimals

8m subs

Reddit's Gold Mine
https://reddit.com/r/AdviceAnimals/

r/Frugal

1m subs

Frugality is the mental approach we each take when considering our resource allocations. It includes time, money, convenience, and many other factors.
https://reddit.com/r/Frugal/

r/bodyweightfitness

1m subs

Bodyweightfitness is for redditors who like to use their own body to train, from the simple pullups, pushups, and squats to the advanced bodyweight movements like the planche, one arm chin-ups, or single leg squats. Start your fitness journey with our Recommended Routine and wiki.
https://reddit.com/r/bodyweightfitness/

r/IAmA

19m subs

https://reddit.com/r/IAmA/

r/triathlon

38k subs

A subreddit dedicated to the sport of triathlon, and all of its constituent components, quirks, and joys.
https://reddit.com/r/triathlon/

r/progresspics

833k subs

post those awesome before/after pictures of yours!
https://reddit.com/r/progresspics/

r/keto

2m subs

The Ketogenic Diet is a low carb, high fat method of eating. And /r/keto is place to share thoughts, ideas, benefits, and experiences around eating within a Ketogenic Diet. Helping people with diabetes, epilepsy, autoimmune disorders, acid reflux, inflammation, hormonal imbalances, and a number of other issues, every day.
https://reddit.com/r/keto/

r/travel

3m subs

r/travel is a community about exploring the world. Your pictures, questions, stories, or any good content is welcome. Clickbait, spam, memes, ads, brochures, classifieds, surveys or self-promotion will be removed.
https://reddit.com/r/travel/

r/Music

21m subs

The musical community of reddit
https://reddit.com/r/Music/

r/CampingandHiking

813k subs

For Backpackers who Hike with Camping Gear in their Backpack. Tips, trip reports, back-country gear reviews, safety and news.
https://reddit.com/r/CampingandHiking/

r/nutrition

534k subs

A subreddit for the discussion of nutrition science. Macronutrients, micronutrients, vitamins, diets, and nutrition news are among the many topics discussed. Civil discourse is required.
https://reddit.com/r/nutrition/

r/femalefashionadvice

936k subs

https://reddit.com/r/femalefashionadvice/

r/cycling

95k subs

bikeit! bike bikes bicycle bicycles bicycling cycling
https://reddit.com/r/cycling/

r/books

17m subs

This is a moderated subreddit. It is our intent and purpose to foster and encourage in-depth discussion about all things related to books, authors, genres, or publishing in a safe, supportive environment. If you're looking for help with a personal book recommendation, consult our Weekly Recommendation Thread, Suggested Reading page, or ask in r/suggestmeabook.
https://reddit.com/r/books/

r/askscience

18m subs

Ask a science question, get a science answer.
https://reddit.com/r/askscience/

r/beer

378k subs

A subreddit to discuss your favorite beers and breweries, and share beer related articles. Quality content encouraged.
https://reddit.com/r/beer/

r/photography

2m subs

/r/photography is a place to discuss the tools, technique and culture of photography. This is not a good place to simply share cool photos or promote your work, but rather a place to discuss photography as an art and post things that would be of interest to other photographers.
https://reddit.com/r/photography/

r/relationships

3m subs

/r/Relationships is a community built around helping people and the goal of providing a platform for interpersonal relationship advice between redditors. We seek posts from users who have specific and personal relationship quandaries that other redditors can help them try to solve.
https://reddit.com/r/relationships/

r/fatlogic

281k subs

Find out what keeps you fat and then do something about it. Sick of being fat? Shed your fatlogic here.
https://reddit.com/r/fatlogic/

r/1200isplenty

312k subs

Whether you want to lose weight through calorie counting, or you're a smaller person who doesn't need more than 1200 calories a day, this is the place for you. Tips, recipes and support for people interested in low-calorie meals.
https://reddit.com/r/1200isplenty/