BOSS

The bent-over row is a primary lat movement — slow tempo under load maximizes lat recruitment.

Maximum push-ups for 30 seconds per round drive significant pectoral volume.

Elbow extension is demanded by both the row lockout and the push-up, making the triceps the most fatigued muscle group in BOSS.

Rear deltoids are loaded in the rows; anterior deltoids and medial deltoids stabilize and work during push-ups.

Plank position maintenance during push-ups and the bent-over row stance require sustained core tension throughout the workout.

Holding a heavy single kettlebell through 12 rounds of slow rows taxes grip endurance considerably.

Heavy bent-over rows at a 10-second tempo across 12 rounds build significant single-arm pulling strength and lat development.

The prescribed 5-seconds-up / 5-seconds-down row tempo is pure TUT training, maximizing hypertrophic stimulus on the lats, rear delts, and triceps.

Maximum push-ups repeated across 12 rounds with no rest between reps demands high muscular endurance in the chest, shoulders, and triceps.

The combination of slow heavy rows and high-rep push-up sets creates the ideal stimulus for upper body hypertrophy.

Eight rounds of 90-second structured mobility work — ankle and hip flow plus Jefferson curl and chest-opening sequences — maintains and develops range of motion throughout the workout.