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Subreddit Directory

Best subreddits for fitness, strength training, and building a healthier body

Reddit's fitness communities cut through supplement marketing and bro-science with evidence-based training advice backed by people who actually lift, run, and track results.

Fitness Reddit covers the full spectrum from absolute beginners to competitive powerlifters and endurance athletes. These communities have developed strong cultural norms against pseudoscience and supplement shilling, making the advice quality significantly above what you find on fitness Instagram or YouTube. For fitness brands, apps, and supplement companies, these subreddits are where informed buyers do research, and where they flag products that underdeliver. The right community depends on the specific goal, r/powerlifting and r/bodybuilding serve strength- and physique-focused lifters with sport-specific programming, while r/xxfitness exists because general fitness spaces skew heavily male and often fail to address training questions specific to women's bodies.

8 subredditscurated for FitnessMember counts are rounded and change daily.

Written by the GrowReddit team

How we know this+

This guidance reflects how our team actually works on Reddit. We research subreddits by hand, read each community's posting rules and moderator guidelines before recommending it, and spend time reading threads to understand the tone and what genuinely earns upvotes. Our recommendations favour community-first participation, useful posts and honest comments, over promotional shortcuts. Subreddit rules change, so re-read a community's current rules before you post.

Top Fitness subreddits by member count
1

r/Fitness

10M+ members
Strict moderation

The central fitness community covering strength training, cardio, nutrition, and general health. Extensive wiki covering programming basics means the community can refer beginners to quality resources rather than repeating advice. Moderation favors evidence-based content over anecdote.

Best content types

Program reviews and comparisonsProgress updates with dataNutrition and diet questionsForm check videos

Posting tip

Post form check videos with specific technique questions rather than general "is this okay", targeted questions get detailed coaching feedback from experienced lifters.

2

r/gainit

680K+ members
Moderate moderation

Muscle gain and weight gain community for people working to build mass. Focuses on caloric surplus, protein targets, and hypertrophy programming. Supportive culture that addresses the specific challenges of people who struggle to eat enough, a distinct and underserved need.

Best content types

Caloric surplus strategiesHypertrophy program discussionsMeal prep for bulkingProgress photo timelines

Posting tip

Share a 6-month bulk progress update with your starting and ending measurements, diet approach, and program, transformation posts with methodology details get saved extensively.

3

r/loseit

3.6M+ members
Moderate moderation

Weight loss community focused on calorie counting, CICO methodology, and sustainable fat loss. High volume of success stories and progress posts. Community norms strongly favor science-based approaches and are skeptical of fad diets, which keeps the advice quality high.

Best content types

Progress milestones with methodologyCICO tracking tipsNon-scale victory postsMaintenance strategy discussions

Posting tip

Post a detailed progress photo update with your calorie target, deficit approach, and timeline, the community generates enormous engagement for posts that show the methodology behind the results.

4

r/running

2M+ members
Moderate moderation

Running community covering training plans, race preparation, injury prevention, and gear. Active training log culture, members follow each other's progress across race cycles. Weekly threads structured around training updates create regular engagement touchpoints.

Best content types

Training plan reviewsRace reportsInjury recovery storiesGear and shoe advice

Posting tip

Write a detailed race report immediately after completing a race with your training approach, pacing strategy, and what you would change, these are among the most-read posts in the community.

5

r/bodyweightfitness

1.8M+ members
Moderate moderation

Calisthenics and bodyweight training community covering skill progressions, strength building without equipment, and movement quality. Strong skill-based culture: handstands, muscle-ups, and planche progressions generate detailed how-to discussions that attract people frustrated with gym-based training.

Best content types

Skill progression guidesHome workout programmingCalisthenics milestone postsMovement quality feedback

Posting tip

Post a detailed skill progression breakdown ("How I got my first muscle-up in 4 months, the exact progressions I used"), skill acquisition content is among the most saved on this subreddit.

6

r/bodybuilding

2.9M+ members
Moderate moderation

Community centered on building muscle and physique, covering training splits, contest preparation, nutrition for bulking and cutting, and supplement discussion. More physique-focused than r/Fitness's general programming approach, with a stronger emphasis on aesthetics and hypertrophy-specific training.

Best content types

Training split and program discussionContest prep and posing feedbackBulk and cut nutrition breakdownsPhysique progress photos

Posting tip

Post progress photos alongside your actual training split and calorie targets, the community engages far more with physique changes that come with the methodology attached than with photos alone.

7

r/xxfitness

3.1M+ members
Strict moderation

Fitness community specifically for women and gender non-binary lifters, strictly moderated to be a safe space free of the body-shaming and unsolicited commentary common in mixed fitness spaces. Covers strength training, nutrition, and body image with programming advice that accounts for physiological differences general fitness communities often overlook.

Best content types

Strength progression updatesProgramming questions specific to women's trainingBody image and non-scale victoriesGym intimidation and confidence discussions

Posting tip

Ask programming questions with your training history and specific goal included, the community gives detailed, judgment-free responses when it is clear you have already done some homework.

8

r/powerlifting

2.7M+ members
Strict moderation

Community dedicated to the sport of powerlifting, focused specifically on the squat, bench press, and deadlift. Highly technical discussion of programming, meet preparation, and form covers competitive lifters as well as recreational strength trainees who follow powerlifting-style programming without competing.

Best content types

Programming and periodization questionsForm check videosMeet preparation and peaking adviceStrength standard and progress discussions

Posting tip

Post form check videos from multiple angles with your current numbers included, vague "check my form" requests get less useful feedback than ones with full lift context attached.

Frequently asked questions

What is the difference between r/Fitness and r/bodybuilding?

r/Fitness covers general strength training, cardio, and health for a broad audience without a specific aesthetic or performance goal in mind. r/bodybuilding is narrower and physique-focused, with programming, nutrition, and contest prep advice oriented specifically toward building muscle and improving aesthetics. Someone looking for a well-rounded first program fits r/Fitness better, while someone optimizing hypertrophy or preparing for a physique competition gets more specific guidance from r/bodybuilding.

Why does r/xxfitness exist separately from general fitness subreddits?

The community was created because general fitness spaces on Reddit skew heavily male, and women often faced unsolicited body commentary or training advice that ignored physiological differences relevant to programming. r/xxfitness is strictly moderated to keep the space free of that dynamic, which changes the kind of questions people feel comfortable asking. It remains useful even for topics that are not gender-specific, since the moderation quality tends to produce more thoughtful discussion overall.

Is r/powerlifting only useful for people who compete in meets?

No, a large share of the community follows powerlifting-style programming and cares about the squat, bench, and deadlift without ever entering a competition. The programming and form-check advice applies equally to recreational strength training, and meet-specific content like peaking and weigh-in strategy is clearly distinguishable from general strength discussion. Someone purely interested in getting stronger at the three main lifts will find the community useful regardless of competitive intent.

Which fitness subreddit is best for someone whose main goal is weight loss rather than building strength?

r/loseit is built specifically around calorie counting and CICO methodology, with a large volume of progress posts that show the exact deficit and tracking approach behind the result. r/Fitness is a useful complement once training enters the picture, since its wiki covers programming basics for people who want to preserve muscle while losing fat rather than relying on cardio alone. r/gainit exists for the opposite problem, people struggling to eat enough to gain weight, so it is worth ruling out before assuming loseit is the right fit for every body composition goal.

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