Thanks all.
Ronald Reagon, 'There is nothing better for the inside of a man, the the outside of a horse."
Here’s where ol’ Ronnie got it.
“There is nothing so good for the inside of a man as the outside of a horse” (horse-riding adage)
"There is something about the outside of a horse that is good for the inside of a man” (that is, riding a horse improves a person’s mental or physical health) has often been credited to Winston Churchill (1874-1965), but the saying was popular before he was born. Lord Palmerston (1784-1865) has also been credited with the saying, but documentary evidence is lacking.
Theodore Parker (1810-1860), a minister of the Unitarian church, wrote from the West Indies in April 1859 that his health had improved. The Springfield (MA) Daily Republican added:
“He is able to bathe in the sea and ride horseback, and he says he finds the maxim true that the outside of a horse is good for the inside of a man.”
Theodore Parker’s letter was reprinted in many American newspapers and helped to popularize the saying, but Parker’s remarks indicated that the saying was already in circulation.
Old, old, expression.