This Workout Protects Your Brain For Years

TL;DR

Norwegian 4x4 HIIT generates lactate, which drives cognitive and neuroanatomical changes that remain protective for up to 5 years after just 6 months of training.

Key Points

• 1.Norwegian 4x4 HIIT offers durable brain protection. Done 3 times per week for 6 months, its cognitive and neuroanatomical benefits can persist for approximately 5 years afterward, according to Dr. Tommy Wood.
• 2.Lactate, not VO2 max, appears to be the key driver. Dr. Tommy Wood suggests lactic acid is the primary mediator of cognitive and vascular brain changes, shifting focus away from the commonly cited VO2 max metric.
• 3.High-rep, slow-cadence weight training may replicate the lactate effect. Exercises like 20-rep slow squats or high-rep leg presses can flood the body with lactic acid and may serve as a practical alternative when travel makes traditional HIIT difficult.
• 4.Slowing down lifts reduces injury risk without sacrificing stimulus. A 5-to-10 second up/down tempo increases time under tension, forces lower weights, eliminates momentum, and is recommended for anyone prioritizing longevity over competitive powerlifting.