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Since you mentioned a mountain, start walking a 2 mile down and back up track or similar.
Start with 1 and 1, 2 & 2 etc.....it's free and you learn to meet your neighbors.
Walking is the best low impact exercise
Obviously I know nothing about scubadobadoo's workout habits, but I do have a general observation. Many people who watch video when they are on the elliptical trainer or stationary bike spend their hour in the gym barely moving and apparently oblivious to that fact. Music is, in my opinion, indispensable to the cardio portion of the workout, but video takes your focus off your heart-rate, breathing rate, rpms or whatever feedback you use to make sure the workout is truly demanding.Now I just get on the elliptical and go to town for 40 minutes while I watch an episode of True Blood on dvd.
You might enjoy reading Fitness for Divers by Cameron Martz.. I'm sure some of what he recommends requires gym equipment, but you may be able to adapt it to your particular possibilities.
And kudos to you for being motivated!
Since you mentioned a mountain, start walking a 2 mile down and back up track or similar.
Start with 1 and 1, 2 & 2 etc.....it's free and you learn to meet your neighbors.
Walking is the best low impact exercise