Is this a good bike workout?

i think so. sounds pretty hard.

It does sound good, but the cadence seems high, like too high to maintain for 5:00. Also, are you able to stay on the bike for 1:40?

It looks like he may not be a cyclist and he is trying to replicate 4 x Mile?

I would say (since it is your coach who gave you this) to do it as closely as you can. If you are doing it indoors, it prob won't matter. If outdoors, you are going to need a HRM and a bike computer to monitor cadence.

Do the WU, then do the intervals, focus on a hard effort. He prob gave you a high cadence to keep the stress on the heart. 60 min should be no prob for you.

I see (adjust res as needed) now, so I assume it is indoors. Whatever your coach gives you is fine for indoor cycling. It is not the same as outdoors.

Yeah, it is indoors, on a stationary bike.

I did this for the first time Tuesday, and it went OK, though I only made it 75 minutes, not 90, since it was the first time and my coach told me to cut it short if I felt exhausted after the intervals part. My legs were hurting.

I'm not questioning his workout, and I will stick with it as long as I'm able to. I just wonder if this is something I can do every other day without needing "easy" workouts (though my every-other-day runs are certainly easy runs).