iPhone Screenshots


STACK Conditioning Presented by ASICS is the ultimate workout companion. Featuring a customizable interval timer and fitness challenges, the app allows you to compete against friends and ensures you’ll beat your best times.

The STACK Conditioning Interval Timer can be used to time your interval workouts, whether your training involves sprints, weightlifting, Tabata, CrossFit or anything else. Use it to follow one of the free 8-week sport-specific workout plans that come with the app or follow your own plan. Either way, the audio cues will alert you when it’s time to start and stop, so you’ll never miss a set, even while you’re listening to your favorite playlist while working out.

See where you stack up against your teammates by taking one of the conditioning challenges, which are based on real fitness tests used by pro and collegiate athletes, and performance coaches.

Key Features
**Fully customizable interval timer
Whether you have your own workout or you’re on a STACK Conditioning Program, you can use the interval timer to create and guide your high-intensity workout.

**Pro-level fitness assessments and challenges
Challenge yourself and compete with your friends in conditioning tests used by the pros. Each challenge includes detailed instruction to make sure you know how to perform it correctly.

**Sport-specific conditioning plans
Free, 8-week conditioning plans for your sport - all available within the app, or as a download to print and use offline.

**Tracking features
Sign up or log in using your STACK Conditioning account and save your workout times to your profile.

** Apple Watch integration so you can use the Watch to start and pause the timer if it's on your arm band.

**Store locator
Find the ASICS store closest to you.


STACK exists to educate and inspire the next generation of athletes. STACK platforms include: STACK.com, the digital home of all STACK content and web-based tools reaching more than 15 million monthly unique visitors, STACK Magazine, targeted to high school athletes, with a circulation rate base of 875,000 and readership of more than 5 million, distributed in 13,500 high schools across the country, representing 75% of all high schools with varsity sports programs; and STACK Velocity Sports Performance, the largest athletic performance training organization in North America with 40 STACK Velocity training facilities across the United States. Learn more at www.stack.com

What’s New

Version 1.6

Video interstitial click through URL update

Ratings and Reviews

3.1 out of 5
14 Ratings
14 Ratings
Edmund Hurdle ,

Sprinter/Track and field

This is a great app. You just need to know how to used it. Something I found very helpful is that you can have timed intervals ( very good for high intensity training/sprinter training) For arm swing speed and power I recommend you set the clock for 10-20 sec with 35 seconds rest for arm swings as fast as you can with (good form)

ToñitoPierrott ,


STACK Need to make more #apps for fitness and nutrition!
Love this app ! Could use a couple more settings but great the way it is now.
STACK always 5 stars!

FrankieG2465 ,


Doesn't look anything like the version in the store. The watch can only start and stop the timer set on the phone. You can't set the timer, see progress or get an alert (haptic) when the interval is up. Basically useless for the Apple Watch.


STACK Media Inc.
24.5 MB
Health & Fitness

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2015 STACK Media


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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