Impulse - Sprint Mechanics
Sprint Acceleration Anaylsis
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Your first three steps determine your acceleration. Impulse tells you exactly what's happening in each one.
Film your sprint in slow motion and Impulse automatically extracts the mechanics that matter: shin angle at ground contact, ground contact time, and flight time across each step. No lab equipment. No sensors. Just your iPhone.
The same data that previously required a university motion capture lab is now in your pocket.
THE SCIENCE
When your shin is vertical at ground contact, force drives straight down — pushing you up, not forward. A forward shin angle redirects that force vector backward, converting it into horizontal velocity. Shin angle is the single biggest mechanical determinant of how fast you accelerate off the line.
WHO IT'S FOR
Sprinters, football players, basketball players, or any athlete who needs to be faster in their first few steps. If your first step matters, your mechanics matter.
WHAT YOU GET
Shin angle at each ground contact across your first three steps
Ground contact and flight time per step
Speed at each step calculated from your footage
Session history to track improvement over time
See how your mechanics correlate with your speed across sessions
HOW IT WORKS
Prop your phone at hip height from the side. Film your first 3-4 steps in slow motion. Impulse processes the footage and delivers a full mechanics breakdown in minutes.
Ratings & Reviews
Redesigned onboarding experience
The developer, KEERTAN RAO SAWTELL, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- User Content
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- KEERTAN RAO SAWTELL
- Size
- 62.9 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Keertan Sawtell