Coherence
Week 2 of this 4 week progression.
Added a 30 second sprint, try to come back to baseline as quickly as possible in the ‘moderate’ pace that follows the sprint.
Moderate and "hard" should stay consistent even though the moderate intervals are reducing and minimizing rest for going hard.
This can be completed on 1 piece of equipment or two different pieces. Test different modalities if you always trend towards the same one for cardio