Run-Walk Intervals: A Beginner Triathlon Running Session

Session Overview

If you’re new to running in triathlon, this 30-minute run-walk session is where to start. Using alternating run and walk intervals, you’ll build aerobic capacity, strengthen connective tissue, and develop the confidence to run off the bike — all without the injury risk that comes with jumping straight into continuous running.

What You’ll Need

• Running shoes (any comfortable pair)
• GPS watch or phone with timer
• Flat or gentle terrain (park, path, or quiet road)
• Water bottle for after

Warm-Up (5 minutes)

Walk briskly for 5 minutes to elevate your heart rate and loosen your legs. Swing your arms, take long strides, and breathe deeply. Optional: add 10 leg swings and 10 hip circles each side before starting the intervals.

Main Set

10 rounds of alternating run and walk intervals. Keep your run effort easy — you should be able to speak in short sentences throughout:

• Run 2 minutes at easy, conversational pace (RPE 4–5/10)
• Walk 1 minute at brisk pace
• Repeat 10 times (30 minutes total)

Cool-Down (5 minutes)

Walk for 5 minutes at a comfortable pace to allow your heart rate to return to normal. Finish with a standing quad stretch, calf stretch, and hip flexor stretch — holding each for 20–30 seconds per side.

Coaching Notes

• The walk breaks are not failure — they’re programmed recovery that lets you complete more total running safely
• As you improve, progress to 3 min run / 1 min walk, then eventually 5 min run / 1 min walk over several weeks
• Run off the bike in your next brick session using the same run-walk format to start — your legs will feel very different after cycling
• Target heart rate during run intervals: Zone 2, roughly 60–70% of max. If you’re gasping, slow down or extend the walk break