3x 3km Sub-Threshold (Zone 4)

• 3km Easy Z1-Z2
• 3km @ Z4 Sub – Threshold
• 2min Easy
• 3km @  Z4 Sub – Threshold
• 2min Easy
• 3km @  Z4 Sub – Threshold
• 2min Easy
• 2-3km Easy Z1-Z2

Perfect for runners who are a few months out from a half marathon or marathon/ultramarathon runners looking to increase their weekly training load without increasing their duration. 

Due to the high workload, sub-threshold running allows you to get a sizeable metabolic stimulus. Still, the mechanical stimulus is relatively low since you’re not running much faster than your marathon pace.