A production-ready HPE MVP should focus on a small set of validated exercises and reliable real-time performance rather than broad feature coverage. The recommended starting scope includes:

• 4–6 foundational exercises such as air squats, lunges, push-ups, planks, and jumping jacks, each with a defined camera view (front or side).
• Exercise-specific rep or hold logic, with 2–3 high-signal form checks and recap metrics.
• A camera setup assistant ensures the user is properly framed within ~15 seconds, including checks for full body visibility, lighting quality, camera stability, and positioning guidance.
• Accurate rep counting logic based on movement phase segmentation using joint angles, velocity, and confidence gating.
• A recap screen showing reps, time, and clean vs. partial reps so users clearly understand performance and improvement areas.

This focused scope allows validation of tracking accuracy, coaching quality, and retention impact within a 3–6 month MVP timeline.

Start with 2D for speed, reliability, and simpler UX, especially for common exercises (squats, lunges, push-ups, plank, jumping jacks). Add 3D only when you have a clear product reason (biomechanics, complex sports drills) and the team to validate it properly.

You should track the following KPIs 90 days after HPE launch:

• camera-permission opt-in
• session completion
• cue acceptance (user agrees/disagrees)
• false-cue reports
• retention by cohort (week-4/week-8)
• conversion to premium, and performance by device/environment (lighting, angles, FPS/latency).

Use phased rollout: internal dogfooding → beta cohort → limited geography/device list → gradually expand. Couple this with feature flags and model versioning so you can roll back quickly if cue quality drops.

Costs depend mainly on architecture (cloud vs hybrid vs on-device), scope (POC vs MVP vs production), and custom features (exercise logic, coaching, personalization, tooling).

• POC (1-3 months): $30k–$75k
  Validates pose tracking + 1–2 similar exercises + basic scoring and a demo UX.
• MVP (6+ months): $75k–$125k
  Typical scope: camera setup assistant, 4–6 exercises, rep counting, 2–3 cues per exercise, recap metrics, basic backend/analytics, device QA.
• Production-ready application (12+ months): $150k–$250k
  Expanded exercise library, robust QA/evaluation suite, model rollouts, monitoring, content tooling, personalization, privacy/compliance hardening, tune natural feed and timing of voice feedbacks (if applicable)

Plan for continuous work: new devices/OS releases, regression testing on a clip suite, threshold tuning, model updates, and expanding exercise coverage. Even with a strong MVP, you’ll need sustained ML + QA capacity to keep quality stable. Ongoing costs after launch can be around $10k–$80k/month, depending on team size and whether you run cloud inference, how often you update models, and how fast you expand the exercise library.

The biggest cost drivers in HPE application development are:
Fully on-device real-time across many phones (highest QA/performance effort)
3D biomechanics (harder data + evaluation + compute)
Multi-person / team-sports scenarios
High privacy/compliance requirements
Rapid expansion from 5 → 100+ exercises (needs admin tools + tuning workflows)