A performance assessment engine for predicting sub-5 mile readiness, identifying the limiter, creating personalized paces, and generating an adaptive 8-week running block.

Current Mile Minutes Current Mile Seconds Current 400m Time Seconds Goal Mile Minutes Goal Mile Seconds

Current Weekly Mileage Current Running Days Per Week Strength Training Days Per Week Training Level Injury Risk

The Castro Challenge

Back Squat 5/3/1 Program Generator

Build a progressive back squat cycle using an 85% training max, controlled PR sets, and cycle-to-cycle progression for the road to a 500-pound squat.

Build Your Squat Cycle

Current Back Squat 1RM

Number of Cycles

Training Max Increase / Cycle

Include Week 4 deload in each cycle

Castro Challenge Squat Standard:
Sets 1–2 are warm-up sets. Sets 3–5 are working sets. Set 5 is the PR set: maximum technically sound reps, capped at 10. No failed attempts. Stop before form, depth, or bar speed breaks down.

Your Generated Program

Enter a current back squat max and generate your program.

Firehouse Strength & Conditioning | Idaho | Firehousestrengthcoach@gmail.com

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