Treadmill Speed Pyramid: 45-Minute Indoor Run Session

Session Overview

This classic pyramid run builds through ascending and descending intervals at 5K race pace, separated by easy recovery jogs. The structure trains your body to produce lactate, clear it, and surge again — a pattern that directly translates to fast triathlon running. The treadmill keeps pace honest when you’d otherwise slow down mid-session.

What You’ll Need

• Treadmill
• Waterproof watch or treadmill display timer
• Heart rate monitor (optional)
• Water bottle — you’ll need it

Warm-Up (10 minutes)

10 minutes easy jogging at Zone 1-2 heart rate (conversational pace). Keep the incline at 1% to simulate road running. In the final 2 minutes, perform 4 × 10-second pick-ups at 10K pace to prime your legs for the main effort.

Main Set

Set the treadmill to your 5K race pace for the hard intervals. Between each interval, reduce speed to easy Zone 1 jogging. The rest periods match the work intervals — so a 1-minute hard effort gets 1-minute easy recovery.

• 1 min at 5K pace (RPE 8-9) → 1 min easy jog
• 2 min at 5K pace → 2 min easy jog
• 3 min at 5K pace → 3 min easy jog
• 4 min at 5K pace → 4 min easy jog
• 3 min at 5K pace → 3 min easy jog
• 2 min at 5K pace → 2 min easy jog
• 1 min at 5K pace → done

Cool-Down (5 minutes)

5 minutes easy jogging at Zone 1 pace, dropping the treadmill speed progressively. Follow with 5 minutes of standing stretches — hip flexors, hamstrings, calves — before stepping off.

Coaching Notes

• Set the treadmill to 1% incline throughout to replicate road conditions — 0% is slightly easier than outdoor running
• Hit your 5K pace from the first second of each interval rather than building into it — the fast change is part of the stimulus
• If you don’t know your 5K pace, use RPE 8-9 (hard but sustainable for 3-5 minutes) as your guide
• Easier version: swap 5K pace for 10K pace and lengthen recoveries to double the work interval. Harder version: reduce recovery periods by 30 seconds each
• Aim for the same or faster pace on the way back down the pyramid despite accumulated fatigue