If you don't have a heart rate monitor just go for about the pace you could hold for 45 minutes to an hour. You should feel like you still have the energy for one more interval after the last one. Otherwise you're pushing too hard.
Walk or jog during rest, up to you.
If music sounds quiet, try turning off Stable Volume in video settings!
*based on this workout:
https://ca.coros.com/stories/athlete-stories/c/jakob-ingebrigtsen-focused-approach-to-indoor-training?tripleSource=klaviyo
00:00 Intro / Warmup
01:50 Interval 1
08:00 Rest 1
9:50 Interval 2
16:00 Rest 2
17:50 Interval 3
24:00 Rest 3
25:50 Interval 4
32:00 Cooldown