The weekends, I walk about 20 km, Why don't walk 5 the week days?

All the  tuesdays and the thursdays I go to the Universidad Popular  to learn english.  I take the bus to go the Univerdiad  and I walk to go back home. Somebody ask me:

Antonio, why do you walk to back home? why  do you drive your car? 

Then I telt you: 

- Because the weekends I walk in the mountains 20 km or more,  why don't walk 5 km  in the city?. I'm no a hurry.

  I prefer to be consistent in my life. I love the simple things, without ornamentation, the life sounds better.