nobody is so busy that on 4 out of 7 days per week they couldn't find 10-15 minutes two times over the course of the day to do some exercise. if you can't you're just lying to yourself.
I really have to agree to Syncro here.
Basically it is all about being honest to yourself. If you say you want to be fit, but cannot find the time, either work harder, and find the time, or stop having a goal that you cannot accomplish.
And about the debate whether to ride or push up Mount Fromme….well, my opinion right now is that it is all about what you want to achieve - if you want to improve your level of fitness, start riding parts of the road, if you are happy just because you are in the forest and out of the office, and you do not have the goal of being able to ride up one day, heck, you are outside, push a bike and will have a blast riding it down beautiful trails.
In the end, you should be happy with your decisions, who should care about your choice? No one but you.
"You don't learn from experience. You learn from reflecting on the experience."
- Kristen Ulmer