# 365days BackExtension — Auto Count Workout

> Daily back extension training app with subscription options. (iPhone/iPad app by Tee-App, Inc..)

- Source: https://appshunter.io/ios/app/365days-backextension/id594894298 (this page in markdown: same URL + `.md`)
- Developer: [Tee-App, Inc.](https://appshunter.io/developer/394429348)
- Category: Health & Fitness, Social Networking
- Price: Free with in-app purchases
- Rating: 4.00/5 from 2 App Store ratings · 52 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 35 MB
- Languages: American English, Japanese
- Released: 2013-03-01
- Data updated: 2026-06-25
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/365days-backextension/id594894298/reviews.md

## What is 365days BackExtension?

A BackExtension-training app that you won't give up on. 
Train your back muscles every day with your iPhone. 


*Users who already have some strength may find the default settings for this app to be a bit low for their strength level. We encourage you to download and try the app to see if it gives you a good workout. And please join our Membership.


=Membership=
Unlock Membership is available through in-app purchasing for Athlete user.

Membership is available with an annual subscription. We have Athlete course($7.99/year), Basic course($3.49/year), and Student course($1.99/year).
You can subscribe and pay through your iTunes account. Your subscription will automatically renew unless cancelled at least 24 hours before the end of the current period. Auto-renew may be turned off after purchase by going to the ‘Manage Subscription’ page in settings.


Terms of Service 
http://tee-app.com/help/termofservice_en.html

## Key features

- Daily back muscle training
- iPhone-based workouts
- Multiple membership courses
- Annual subscription options
- Auto-renewal management

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Athlete Course | $8.99 | per year |
| Basic Course | $3.49 | per year |
| Student Course | $1.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| GoalSetting Kit | $0.99 | one-time |
| GraphKit(+Ad Free switch) | $0.99 | one-time |


## Recent user reviews (10 of 52)

All indexed reviews: https://appshunter.io/ios/app/365days-backextension/id594894298/reviews.md

### 3/5 — Good, but I’m getting glitchs

*2025-03-06, version 17.0.5*

As I’ve stated, the apps good like any of their other apps and also works accurately. But for some reason for this app only, my phone is keep on glitching and “turning off”. It would be great if this got solved!

### 5/5 — 背筋アプリ

*2018-10-14, version 17.0.4*

他にいい背筋アプリがないのでこれを使っていますが、もっと使いやすいアプリがあればと思います。

### 1/5 — カウントされない

*2018-03-22, version 17.0.4*

背筋だけカウントされない。

### 1/5 — 直ぐ落ちる

*2017-04-16, version 2.2.1*

使いたくても使えない

### 4/5 — 出来ますよ？

*2016-10-15, version 2.2.1*

インストールしてアプリ開いた時カメラ許可しなくて開けなかったけどiPhoneの設定からカメラ許可したら開けますよ！カウントほんとにありがたい！

### 2/5 — どうやって使うの

*2016-09-17, version 2.2.1*

えーっと使い方は❔

不思議すぎる

どうしたら スクワットみたいにカウントできるの❔

### 1/5 — なんで？

*2016-09-13, version 2.2.1*

取ってから、一度も開けない！！

### 1/5 — 役立たず

*2016-07-05, version 2.2.1*

開いても開いても即落ちして使い物にならなかった

### 2/5 — 背筋だけ

*2016-05-06, version 2.2.1*

他の腹筋等のアプリと一緒に使っていますが、いくらやっても背筋だけログが残りません。

### 2/5 — どうなってるの？

*2016-02-07, version 2.2.1*

久しぶりに使おうとしたが開けません、一度削除して入れ直したが開けない。
同様の症状が他の人からもずいぶん前から出ているのに、未だ修正できないのか？

## Frequently asked questions about 365days BackExtension

### Does 365days BackExtension have ads?

No, 365days BackExtension does not contain advertisements. The app is free to download and use, with optional in-app purchases for membership courses.

### What are the subscription options for 365days BackExtension?

365days BackExtension offers three annual subscription plans: Student Course ($1.99/year), Basic Course ($3.49/year) with a 7-day free trial, and Athlete Course ($8.99/year) with a 1-month free trial.

### How can I cancel my 365days BackExtension subscription?

Your subscription will automatically renew unless cancelled at least 24 hours before the end of the current period. You can turn off auto-renewal after purchase by going to the ‘Manage Subscription’ page in settings.

### Is 365days BackExtension suitable for beginners?

The app is designed for daily back muscle training. While some users with existing strength might find default settings low, it encourages users to try the app to assess its suitability for their workout needs.

### What devices does 365days BackExtension support?

365days BackExtension is available for iPhone and iPod devices.

### What is the age rating for 365days BackExtension?

365days BackExtension has an age rating of 4+, making it suitable for a wide range of users.

### How often is 365days BackExtension updated?

The latest version of 365days BackExtension is 17.0.5, which was last updated on May 27, 2020. This indicates a history of updates, though the frequency may vary.

### What is the user sentiment for 365days BackExtension?

The app has a rating of 4.0 stars from 2 ratings, suggesting generally positive user sentiment based on the available feedback.

## Version history (last 5 releases)

### 17.0.5 — 2020-05-27

- Fix subscription server error.

### 17.0.4 — 2017-11-08

+ New Icon.
+ New Day Count system. (Scroll up).
+ Bug fixes.

### 17.0.3 — 2017-08-30

+ Added New Calendar design. 
+ Changed Membership free trial term.

### 17.0.0 — 2017-07-13

All new 365days BackExtension.

### 2.2.1 — 2014-10-22

Bug fixes about iOS8.

## More apps by Tee-App, Inc.

- [365days Sit-up](https://appshunter.io/ios/app/365days-sit-up/id416324414)
- [365days Push-up](https://appshunter.io/ios/app/365days-push-up/id421608233)
- [365days Squat](https://appshunter.io/ios/app/365days-squat/id451036970)
- [MechaClock](https://appshunter.io/ios/app/mechaclock/id497059671)
- [Gohobee Tokyo \| Kawaii workout](https://appshunter.io/ios/app/gohobee-tokyo-kawaii-workout/id926654129)

All apps by Tee-App, Inc.: https://appshunter.io/developer/394429348

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-25.*