Now the fun part. Warm up slowly until SmO₂ rises and steadies—a sign blood flow is open. For steady cardio, aim for a zone where oxygen floats between 45 % and 60 %. Power is high enough to grow fitness yet leaves fuel in the tank. During intervals, note how fast SmO₂ dives and how fast it climbs back. Short, quick rebounds mean fresh legs; long, sluggish climbs warn of deep fatigue.
No boards!