# HST Log - Hypertrophy Specific Training — Body Building Workout Program

> Scientifically proven bodybuilding program for muscle size and growth. (iPhone/iPad app by Charles Vanderhoff.)

- Source: https://appshunter.io/ios/app/hst-log-hypertrophy-specific-training/id1216812769 (this page in markdown: same URL + `.md`)
- Developer: [Charles Vanderhoff](https://appshunter.io/developer/950621709)
- Category: Health & Fitness, Utilities
- Price: Free with in-app purchases
- Rating: 3.10/5 from 11 App Store ratings · 16 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 18 MB
- Languages: American English
- Released: 2017-04-03
- Data updated: 2026-08-13
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/hst-log-hypertrophy-specific-training/id1216812769/reviews.md

## What is HST Log?

Hypertrophy Specific Training (HST) is a scientifically proven set of training principles designed to optimize training for muscle size.

Hypertrophy Specific Training is a bodybuilding program based on physiological principles of muscular growth discovered through science. Based on recent research, Hypertrophy Specific Training is the most scientifically valid way to train for muscle size and growth.

In its most basic form Hypertrophy Specific Training consists of an eight week program broken up into four consecutive two week blocks. The first two weeks are spent doing 15 rep sets, starting out at a percentage of your 15 rep max the first day and progressing the load used over the course of two weeks until on the final day of those two weeks you are lifting your 15 rep max. Your muscles will become conditioned to loads and it will eventually become ineffective at causing growth, so we don't want to spend a long period of time using the same load.

After a proper deload your muscles should be receptive to the lighter loads of the early 15s and should respond with growth. The point is not to lift your absolute max each workout, the point is to get growth all throughout the cycle by raising the weight consistently.

Hypertrophy Specific Training operates from 4 main principles:

1. Mechanical Load - Mechanical load is the primary growth stimulus.
2. Acute vs. Chronic Stimuli - Muscle must be exposed to the growth stimulus frequently.
3. Progressive Load - Muscle tissue will adapt to the load as you continue to train.
4. Strategic Deconditioning - When progress stops or growth plateaus, it is necessary to take a break from training.

Hypertrophy Specific Training is intended for intermediate to advanced weightlifters. If you are unfamiliar with weight lifting you should start with an easier program before running a Hypertrophy Specific Training cycle.

Please note: The Hypertrophy Specific Training program was developed by Bryan Haycock. This is not an official HST app and may deviate from information found elsewhere.

## Key features

- Scientifically proven training principles
- Eight-week structured program
- Progressive load increases
- Strategic deconditioning periods
- Focus on mechanical load stimulus
- Frequent exposure to growth stimulus

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| HST Pro | $4.99 | one-time |


## Recent user reviews (10 of 16)

All indexed reviews: https://appshunter.io/ios/app/hst-log-hypertrophy-specific-training/id1216812769/reviews.md

### 1/5 — The 15 10 and 5 rep max settings don’t reliably save

*2023-04-06*

This is maddening to go through a workout to figure out my max weights and the app lost about half of it. This has happened multiple times and the first time I assumed I had done something wrong, but then the second and third times the problem kept happening. I seriously regret purchasing this.

### 3/5 — Increments are weird

*2022-02-23*

I’m new to HST so this might be me… but most of my weights first day were zero. It’s hard to figure out what to change the increments to if I can’t see them in one grid. I’m switching to an excel spreadsheet.

### 3/5 — Almost there

*2020-11-24*

On the latest iOS I can't change the weight increment type. It's a blank screen.

### 1/5 — Pro 업그레이드 해도 안바뀌네요

*2020-10-30*

돈만 날린듯 싶네요. 수정 부탁드립니다.

### 1/5 — Was good when it worked

*2020-10-06, version 1.0.5*

I purchased the pro version which worked really well. It’s now stopped working and I am
Unable to start a new cycle which has rendered the app useless.

### 1/5 — 쓰레기임

*2020-07-13*

프로 업그레이드했는데 에러 계속 나서 지우고 다시 깔았더니 또 돈내고 업그레이드하라고함. 에러 좀 고쳐라. 만지작 거리다가 운동시간 다 쳐먹네.
 U gotta fix bugs. Too many bugs, cannot even use the app. Wast my workout time.

### 1/5 — Doesn’t work

*2020-04-05, version 1.0.5*

Won’t populate weights in the workout section. Doesn’t save change from lbs to kgs. Buggy and unusable, sadly

### 1/5 — Do not buy it

*2019-10-26, version 1.0.5*

I bought the pro version and app doesn’t allow to include more exercices.
I saw on reviews that its happening since 2 years ago... Im gonna ask for a refund and report the seller.

### 1/5 — Unusable with bugs

*2019-08-16, version 1.0.5*

Massive bug when selecting weight increments that the screen doesn’t work making the app no usable at all
Developer disappeared and won’t reply to emails

### 3/5 — Needs some updates

*2019-07-09*

I’ve been using it for 3 weeks now and I do like it but Reorder workouts doesn’t work. And you also can’t update the weight lifted while working out.

## Frequently asked questions about HST Log

### What is HST Log?

HST Log is a bodybuilding program based on Hypertrophy Specific Training principles, designed to optimize muscle size and growth through a structured eight-week cycle.

### Who is HST Log for?

This program is intended for intermediate to advanced weightlifters. Beginners are advised to start with an easier program before attempting a Hypertrophy Specific Training cycle.

### How does HST Log work?

It follows four main principles: mechanical load, frequent exposure to growth stimulus, progressive overload, and strategic deconditioning to prevent plateaus and encourage growth.

### What is the structure of the HST program?

The program consists of an eight-week cycle divided into four two-week blocks, starting with 15-rep sets and progressively increasing the load.

### Is HST Log an official app?

No, this is not an official HST app. The Hypertrophy Specific Training program was developed by Bryan Haycock, and this app may deviate from information found elsewhere.

### What devices does HST Log support?

HST Log is supported on iPhone, iPad, and iPod devices.

### How often is HST Log updated?

The latest version is 1.0.5, and the app was last updated on July 26, 2017.

### What is the user rating for HST Log?

HST Log has a rating of 3.1 stars from 11 ratings.

## Version history (last 5 releases)

### 1.0.5 — 2017-07-26

This app has been updated by Apple to display the Apple Watch app icon.

- Fixing a bug that could save incorrect set weights to the history log

Let us know if we can do anything to make the app better for you! Please be sure to review the app so others can find it when searching.

### 1.0.4 — 2017-07-22

- Fixing a bug that could save incorrect set weights to the history log

Let us know if we can do anything to make the app better for you! Please be sure to review the app so others can find it when searching.

### 1.0.3 — 2017-07-01

- Bug fixes and performance improvements

Let us know if we can do anything to make the app better for you! Please be sure to review the app so others can find it when searching.

### 1.0.2 — 2017-05-25

- Bug fixes and performance improvements.

Let us know if we can do anything to make the app better for you! Please be sure to review the app so others can find it when searching.

### 1.0 — 2017-04-03

No release notes.

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## More apps by Charles Vanderhoff

- [One Rep Max: 1RM Calculator](https://appshunter.io/ios/app/one-rep-max-1rm-calculator/id950621710)
- [Wendler Log 531](https://appshunter.io/ios/app/wendler-log-531/id962162633)
- [Barbell Calculator Gym Calc](https://appshunter.io/ios/app/barbell-calculator-gym-calc/id979112637)
- [5x5 Workout - Madcow & Reg Park](https://appshunter.io/ios/app/5x5-workout-madcow-and-reg-park/id1011004314)
- [30 Day Ab Challenge - Amazing 6 Pack Abs Workouts](https://appshunter.io/ios/app/30-day-ab-challenge-amazing-6-pack-abs-workouts/id1024207720)
- [30 Day Push Up Challenge - Arm & Bicep Workouts](https://appshunter.io/ios/app/30-day-push-up-challenge-arm-and-bicep-workouts/id1030027145)

All apps by Charles Vanderhoff: https://appshunter.io/developer/950621709

## Related topics

[hst log](https://appshunter.io/ios/topics/hst-log) · [hypertrophyai](https://appshunter.io/ios/topics/hypertrophyai)

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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 2026-08-13.*