What’s a SMART sprint range for 40+ (treadmill)?

10–20 seconds all out full recovery after

15 seconds sprint 60–90 seconds walk

Speed where form stays crisp no heel striking

Warm up 5–8 minutes before the first sprint

Incline 1–2% to reduce joint stress

Stop the set when speed drops noticeably

Full nasal breathing during recovery.

Keep total sprint time under 3 minutes

Land mid-foot under your hips

If knees feel it the next day shorten the sprints

Heart rate should spike fast then fully drop before next

Pair with leg days not the day before