Record 037 · Training · 2007
50%07.37.T
Norwegian 4×4
Jan Helgerud / NTNU
“4 × 4-minute intervals at ~90–95% HRmax with 3-minute recoveries.”
Helgerud's cardiac-output intervals became a municipal-health and soccer-club protocol. A clock, a heart rate, a rest.
A specified VO2 interval session with a public life.
- 4×4 min @ 90–95%
- Active recovery
- Clinic and pitch use
Four minutes, four times.
