The aerobic recommendation is 2.5hrs of brisk walking (i.e. 7 to 8 miles, e.g just over a mile a day). You'd have to be pretty dedictated to a sedentary lifestyle not to manage that.
On the other hand, you have to think about doing the equivalent of 1 set of 12 reps to exhaustion on each major muscle group twice a week.
For the record, I live about 20 (~100m) blocks from work, and it takes me 20-30 minutes. Since everyday I go with a backpack full of stuff (notebook, paper notebooks, a few books and a table), I'm also carrying 5 to 7kg of extra weight. And I try to never use the elevator, since it's just 3 floors up and down (on rare ocassions do it 2 or 3x in the day, but over a span of hours).
While all this seems exceedingly little, in the end it adds up so that I "don't do excercise" but I still keep a baseline shape. And I'm totally amazed at how many people will frown upon even doing as little as I do on a daily basis.
Strength is trickier. Nothing in my day to day life requires me to pull something 12 times in succession in such a way that my lats will refuse to do a 13th pull.
The obvious exception to this is track and road sprinters who benefit considerably from doing weight work. Everyone else serious about riding should just ride.
afaik, most elite cyclists do not squat. I'm guessing endurance and low body weight are more advantageous to the sport.
I'm sure there are studies. Can anyone else chime in?
There's a lot of different ways to strength train, it's not all seemingly pointless tasks.
That definitely sums up myself. I am a cyclist. My totals for this week are 147.1 miles with 15,497 feet of climbing (I do nothing but mountains, flat is boring!), but if you ask me to do 10 push ups, I will complain! For me aerobic activity engages my mind. There is a destination. The environment moves and is changing. When climbing up a hill, I have no choice to push myself if I am ever going to get to the top. Push ups? I simply stop when my body resists.
Despite my complaints, I do some strength training. Core strength is important in cycling and it is my upper body that fails during long rides, not my legs. My legs can keep going, but my shoulders give out due to constant vibrations.