I enjoy horseback riding(equestrianism)!  Do you ride?
I used to ride! I still own horses, but I've trained them for practical working purposes now. They pull farm equipment for me. 
Really!  That's practical.  Are they horses specifically bred for that purpose?
The ones I own are not, but I've worked with breeds like the Percheron that are bred to be "in harness". 
Interesting!  How much do these horses weigh?
Percherons were originally used as war horses, so they can weigh upwards of a ton. They had to be so big to carry knights in all their armor - which could weigh more than 400 lbs. 
Fascinating!  So I guess they were the first "tank"!
You could say that! I also love watching horse sports like in the Olymics. Dressage and show jumping are some of my favorites to watch.