Bryan Johnson hit a 265 lb PR on heel-elevated front box squats, up 10 lbs from last week. He's training to dunk at 49 years old.
His biomechanics breakdown:
• 6'0", 180 lbs, 91" standing reach
• Needs ~35" vertical (NBA average is 34")
• Target takeoff velocity: 14.5 ft/s
• Required ground force: 585 lbs
• Peak power output: 14.8 hp (11 kW)
• Takeoff window: 0.2 seconds
The landing physics are brutal:
• Ground reaction force: 1,080-1,800 lbs (6-10x bodyweight)
• Knees absorb 7-9x bodyweight on impact
• Force channeled through centimeter-thick tendons
• Achilles rupture risk 3-5x higher for his age group
Age tax on performance:
• Power output and rate of force development down 25-40% at 48
• Tendon elasticity and recovery capacity significantly reduced
This is essentially a power-to-weight optimization problem with a rapidly closing biological window. He's treating dunking like an engineering challenge—quantifying every variable, isolating the constraints, and systematically attacking the weakest links in the kinetic chain. The real question isn't whether the numbers add up, it's whether connective tissue can handle the explosive load cycles required to hit those force thresholds.
His biomechanics breakdown:
• 6'0", 180 lbs, 91" standing reach
• Needs ~35" vertical (NBA average is 34")
• Target takeoff velocity: 14.5 ft/s
• Required ground force: 585 lbs
• Peak power output: 14.8 hp (11 kW)
• Takeoff window: 0.2 seconds
The landing physics are brutal:
• Ground reaction force: 1,080-1,800 lbs (6-10x bodyweight)
• Knees absorb 7-9x bodyweight on impact
• Force channeled through centimeter-thick tendons
• Achilles rupture risk 3-5x higher for his age group
Age tax on performance:
• Power output and rate of force development down 25-40% at 48
• Tendon elasticity and recovery capacity significantly reduced
This is essentially a power-to-weight optimization problem with a rapidly closing biological window. He's treating dunking like an engineering challenge—quantifying every variable, isolating the constraints, and systematically attacking the weakest links in the kinetic chain. The real question isn't whether the numbers add up, it's whether connective tissue can handle the explosive load cycles required to hit those force thresholds.