This is a primarily sustained effort session, comprised of 10, 4-minute blocks with just 1 minute of short recovery between them. We 'countdown' as: 4 @ 80% FTP (moderate start) 3 @ 90% FTP (sweetspot) 2 @ 100% FTP (threshold) 1 @ 110% FTP (VO2 Max)
As the fatigue builds, stay strong to hit the power targets!