# Impulse - Sprint Mechanics — Sprint Acceleration Anaylsis > Mobile app for analyzing sprint acceleration mechanics using iPhone slow-motion video. (iPhone/iPad app by KEERTAN RAO SAWTELL.) - Source: https://appshunter.io/ios/app/impulse-sprint-mechanics/id6786762191 (this page in markdown: same URL + `.md`) - Developer: [KEERTAN RAO SAWTELL](https://appshunter.io/developer/6786762193) - Category: Health & Fitness, Sports - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 15.1 · 60 MB - Languages: American English - Released: 2026-07-08 - Data updated: 2026-07-24 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/impulse-sprint-mechanics/id6786762191/reviews.md ## What is Impulse? 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. ## Key features - Shin angle at ground contact - Ground contact time - Flight time per step - Calculated speed per step - Session history tracking - Mechanics correlation with speed ## Frequently asked questions about Impulse ### What is Impulse used for? Impulse is used to analyze the mechanics of your first three sprint steps. It provides data on shin angle, ground contact time, and flight time, helping athletes understand and improve their acceleration. ### How does Impulse analyze sprint mechanics? You film your first 3-4 steps in slow motion with your iPhone. Impulse then automatically processes the footage to extract key mechanical data without requiring any external sensors or lab equipment. ### What specific data does Impulse provide? Impulse provides your shin angle at each ground contact, the ground contact and flight time for each step, and the calculated speed at each step. It also allows you to track your session history to monitor improvement. ### Is Impulse suitable for all athletes? Impulse is designed for any athlete who needs to be faster in their first few steps, including sprinters, football players, and basketball players. If your initial steps are crucial for your sport, Impulse can help. ### What are the technical requirements for Impulse? Impulse is available for iPhone and iPod. It requires filming in slow motion, and the phone should be propped at hip height from the side for optimal results. ### How often is Impulse updated? The latest version of Impulse is 1.0.2, which was last updated on July 13, 2026. While this is the initial release, updates are expected to continue to refine its features and performance. ### Does Impulse have ads? No, Impulse is free and does not contain advertisements. This allows for an uninterrupted analysis experience focused on improving your athletic performance. ### What is the age rating for Impulse? Impulse has an age rating of 4+, making it suitable for a wide range of users interested in athletic performance analysis. ## Version history (last 4 releases) ### 1.0.3 — 2026-07-19 Redesigned onboarding experience ### 1.0.2 — 2026-07-13 Added an in-app filming guide to help you get camera setup right. Backend accuracy improvements and bug fixes. ### 1.0.1 — 2026-07-12 Bug fixes and accuracy improvements to the analysis pipeline. Share functionality fixed. ### 1.0 — 2026-07-08 No release notes. --- *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 2026-07-24.*