The data is clear that you need to do both. Even steep climbs where you're huffing and puffing hard aren't "anaerobic." It's a popular misconception that's not an accurate description of what's happening physiologically. Lots of long easy miles at lower heart rates builds your aerobic base in ways that higher intensity work does not. If you put in that work you'll be able to go up sustained steeps faster at the same HR, or maintain your current max pace for longer.
If you were feeling burnt out doing both my guess is that the trainer rides were too hard. The time commitment part is something that you can't really get around, though. There's a bunch of different physiological adaptations that occur in response to training and independently add up to increase your aerobic capacity. Some of these adaptations are maximized at high intensities and others at low intensities, and unfortunately the low-intensity ones require a lot of time. This article series is a pretty good primer on how endurance training works: Methods of Endurance Training » Bodyrecomposition
Dylan Johnson lays out a great basic season-long training plan in this video. It's also worth watching his videos on base training, weight lifting, and getting fast on <10 hrs/week in the saddle (everything on his channel is pretty great, really).
Yes, a spin bike and HRM will work. Just make sure you get something with magnetic resistance, friction ones are junk. I own this one and for what it costs it's pretty solid: https://www.walmart.com/ip/MaxKare-...VEGpvBB0XVQGQEAQYAiABEgKOOfD_BwE&gclsrc=aw.ds. The pedals and saddle are junk and the computer isn't worth much.
If you were feeling burnt out doing both my guess is that the trainer rides were too hard. The time commitment part is something that you can't really get around, though. There's a bunch of different physiological adaptations that occur in response to training and independently add up to increase your aerobic capacity. Some of these adaptations are maximized at high intensities and others at low intensities, and unfortunately the low-intensity ones require a lot of time. This article series is a pretty good primer on how endurance training works: Methods of Endurance Training » Bodyrecomposition
Dylan Johnson lays out a great basic season-long training plan in this video. It's also worth watching his videos on base training, weight lifting, and getting fast on <10 hrs/week in the saddle (everything on his channel is pretty great, really).
Yes, a spin bike and HRM will work. Just make sure you get something with magnetic resistance, friction ones are junk. I own this one and for what it costs it's pretty solid: https://www.walmart.com/ip/MaxKare-...VEGpvBB0XVQGQEAQYAiABEgKOOfD_BwE&gclsrc=aw.ds. The pedals and saddle are junk and the computer isn't worth much.