MAP•SBL is an 8-week BOSX speed and power protocol built around one thing: the Superficial Back Line — the fascia chain that actually drives sprinting, jumping, and top-end speed.

Instead of guessing with track workouts you found on YouTube, you get a clear map: strength, plyos, and movement drills all organized to load and reload the same line so your body finally understands how to produce force, redirect it, and repeat it under fatigue.

MAP•SBL is built for field and court athletes (football, basketball, soccer, volleyball, softball, etc.) who:
– Need faster acceleration and sharper first-step quickness
– Want hamstrings and backs that stay healthy under real game loads
– Are tired of “speed training” that doesn’t show up on film

Each week you’ll follow a structured progression:
– 3–4 sessions per week (strength + field work)
– Line-based warm-ups that prep the hamstrings, calves, and posterior chain
– Key lifts and accessory work that match the sprint pattern
– Plyometric and acceleration drills that teach you how to use your new power

The Bridge edition of the BOSX SBL Protocol is the fully interactive training experience. Includes real-time updates, built-in coaching prompts, and auto-calculating progressions. Perfect for athletes, coaches, and elite users who want a seamless dashboard and cloud-accessible workouts. Includes: • Full 6-week Superficial Back Line (SBL) program • Auto-adjusting % loads • Weekly progression updates • In-app coaching prompts • Secure dashboard access from any device • Embedded PDF + conversion tracker Once you purchase, you’ll get the official Bridge access link for full system use.