Heart rate monitor is very important. You can get away with not having a smart trainer with power, as programs such as Zwift will still estimate your power output and still give you a good workout on their training plans - my son now uses my old fluid trainer. Before I got Zwift and a smart trainer, I used a Fluid 2 and watched Spinerval DVDs which would give you a great interval workout. I've also done 2+ hours trainer rides with intervals (based on speed and heart rate) while watching TV and movies.
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