2. I don't know anyone that leaves their home for three separate trips on transit a day. Two tops, and usually it's just one. It's rare to leave the home three times in one day with a car if one of the trips is an eight hour workday. Usually people combine trips.
3. Again, walking is good. We should be walking. It's fantastic to have places to walk to. This isn't a bad thing or a chore.
And no, going to gym is not easier. It costs money, it is time consuming and it does not have the same effect as normal walking.
Is not this the problem with transit? Your traveling is so cumbersome that you seem to be restricting yourself to the bare minimum. Of course, you can also claim "that's a good thing!" but can you talk from the both sides of your mouth and claim that transit is faster and more convenient while also limiting your travel options?
> Take just three trips and your day just turned into a 22 and a half hour one only factoring the walk on the home side.
The exact same thing goes if you go to the same place with a car. But, first, you did not had that healthy factor of walking. Second, if you are tired, overworked, have troubles you need to think about or want to listen some educational tape, you are becoming hazard on road as a bonus.