Archimedes makes some great points about workouts not having to be "all or nothing".
Over 2 years, you have almost certainly lost all the fitness and conditioning that you had. And you need to ramp up gradually to get back to where you were.
One option might be to actually write yourself out an exercise program. Start with where you are now, and set a goal of where you want to be in 8 weeks time, and then build progressively towards that goal. Hopefully by writing it down, you can remind yoursel not to push too hard too soon.
As long as you are improving, you are NOT wasting your time.
Spinning is an intense workout, and probably something you should wait a few weeks to build your fitness for before tackling it.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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