App Overview

3AK Sprinting icon

3AK Sprinting

CHRISTIAN MICAH JONES · Sports

Sprinting is the fastest way to get fit, 3AK makes it simple while guiding you every step of the way.

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
2,396 ratings · Top 5%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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A product spec, screen plans, and build steps for your coding agent.

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What's included18 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for 3AK Sprinting: map the core Sports workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

Screenshots

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App Store description

Sprinting is the fastest way to get fit, 3AK makes it simple while guiding you every step of the way. You don't need hours of jogging to change your health. A few short sprint sessions a week can lift your cardio fitness, build lean muscle, and give you more energy — in a fraction of the time. 3AK builds your plan, coaches your technique, and tracks every step of your progress. WHY SPRINTING - Time-efficient — real results in 20–30 minutes, not endless miles - Heart & lungs — raise your VO2 max and cardiovascular fitness - Strength & power — build lean muscle that steady-state cardio can't - All-day burn — keep your metabolism working after you finish WHAT YOU GET - A personalized plan — adaptive sprint sessions built around your level and updated as you improve - Daily readiness check — tell 3AK how your body feels and it tunes the session to match - AI sprint analysis — breaks your run into phases (reaction, drive, acceleration, top-end, speed, finish) so you know exactly what to work on - Sprint Age — see how fit you really are, and watch it get younger as you train - Strength training — guided lifts that build the power behind your speed - Snap-to-log nutrition — photograph a meal for instant calories and macros NEVER SPRINTED? PERFECT. No track, no experience, no problem. 3AK meets you where you are and coaches you every step — from your first stride to your fastest. Start sprinting smarter. Download 3AK and feel the difference in weeks, not months. Join 50,000+ people already training with purpose. SUBSCRIPTION INFORMATION 3AK requires a subscription to access all features, including AI Stride & Form Analysis, AI Coaching, Custom Workout Programs, Smart Nutrition Tracking, Daily Challenges, and Performance Analytics. Subscription prices and plans are displayed within the app at the time of purchase. Payment is charged to your Apple ID account at confirmation. Subscriptions auto-renew unless turned off at least 24 hours before the end of the current period. You can manage or cancel anytime through Apple ID Account Settings. Any unused portion of a free trial is forfeited when you purchase a subscription. LEGAL Privacy Policy: https://agate-elm-c96.notion.site/3AK-Privacy-Policy-2ef5370fd0a080b5b5e0f3923e47fe68?source=copy_link Terms of Service: https://app.termly.io/policy-viewer/policy.html?policyUUID=d3cbe04f-3efc-4612-86ab-83971d8c244e EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Expand workout options to include more activities.

Assumption to check: Limited workout types may not cater to all users.

Validate with people who use this workflow before building.

Hypothesis 2

Implement advanced tracking features or integrations.

Assumption to check: Tracking accuracy may vary for different exercises.

Validate with people who use this workflow before building.

Hypothesis 3

Introduce personalized workout recommendations.

Assumption to check: User engagement may drop without personalization.

Validate with people who use this workflow before building.

Hypothesis 4

Simplify subscription tiers and clarify benefits.

Assumption to check: In-app purchase structure may confuse users.

Validate with people who use this workflow before building.

Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

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BUILD KIT DIFFICULTY
Advanced

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.