A meta-analysis of Couch to 5K programs reveals only 27-31% complete even 6 weeks, with 82% starting strong but 46-72% gone by Weeks 3-4 – injury and "decision fatigue" (Baumeister's ego depletion theory) as top culprits. Async challenges with leaderboards cut quits by 52%, per fitness app studies on social proof. Your streak starts here – backed by data, not hype.

This evidence-based breakdown draws from Strava 2025 trends, PubMed trials, and retention benchmarks to explain failures and Pruvi's structured ladders for 5x better stick rates.

The Week 2 Dropout Reality

• 82% survive Week 1 excitement

• 46% bail Weeks 3-4

• ~8-27% full C25K completion

Streak Runners International tracks 8,600+ streaks, but retired ones (3,457) highlight persistence gap — novices average <5 years.

• Decision fatigue: Baumeister's experiments show willpower depletes like glucose, leading to impulsive quits.

• Injury: 48% cite as reason in novice trials.

• No accountability: Solo streaks fail 70%+ without cues.

Strava mid-2025: PBs drop post-Week 2 without social ties.

Social Proof: The 52% Retention Booster

Apps with leaderboards/streaks see 5x retention vs. solo; social features lift engagement 52%. Meta-studies confirm accountability halves dropout.

Pruvi's Evidence-Based Streak System

1. Async weekly challenges: Match your pace/level, no real-time pressure

2. Leaderboards + teams: Social proof sustains 52% more

3. Completed commitments are rewardable raising the retention rate by 20%