Proving Ground vs Muscle & Flow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Proving Ground
Book functional training classes and personal training sessions at a revolutionary studio. View schedules, reserve spots in group classes, and purchase class packages directly through the app. Focus on smart training with mobility and recovery integrated into every workout.
- Book training classes
- View class schedules
- Purchase class packages
- Personal training sessions
- Functional training focus
- Mobility and recovery integration
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The official app of Proving Ground Studio in Hull, MA. Download the app to find and book training classes. From the app you can view class schedules, book group classes, purchase class packages. Proving Ground is a revolutionary training studio offering top-quality functional training classes and personal training sessions. We focus on training smart, with mobility and recovery as key ingredients of each workout. “Sometimes we are tested. Not to show our weaknesses, but to discover our strengths.” This is Proving Ground.
Muscle & Flow
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For members of Muscle and Flow to reserve their place in a class, sign up for gym events, and general account management like updating headshots and credit card on file.
Screenshots
Verdict
The clearest difference is device support: Muscle & Flow at 3 against Proving Ground's 1. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly monthly. The most recent releases landed on November 3, 2026 and October 27, 2026 respectively.
| Parameter | Proving Ground | Muscle & Flow |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (210 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 210 — better | — |
| Update frequency | Monthly | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15 — better |
| Further details — not scored | ||
| Size | 38 MB | 91 MB |
| Age rating | 4+ | 4+ |
| Developer | Proving Ground Limited Liability Corporation | Muscle & Flow |
In-app purchases
Proving Ground
No in-app purchases
Muscle & Flow
No in-app purchases
Questions
Is Proving Ground free?
Is Muscle & Flow free?
Do Proving Ground or Muscle & Flow have ads?
Which is updated more often, Proving Ground or Muscle & Flow?
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