Arnold Schwarzenegger Does Personal Training Session for $150k For School Charity

Arnold Schwarzenegger may be the most expensive personal trainer in the land, because Sunday he worked out 2 crews that each plunked down $150,000 ... all for an incredible cause.

Arnold was at Gold's Gym in Venice, which he made world-famous, and made good on a charity auction at his home Saturday night.

Morris Flancbaum from Florida and his fam bid the $150k to get a good pump under Arnold's tutelage. Morris and his sons got pointers from The Terminator as a crowd formed to watch. Another $150k auction winner was there as well, getting fit with Arnold.

The charity -- After-School All-Stars -- is fantastic. Arnold created it 30 years ago to benefit school kids around the country. It provides after-school programs and exercise for 100,000 kids in 60 cities.

This time around folks donated $5.2 million, of which $1.75M came from the auction. In addition to a training session, Arnold auctioned off clothes, humidors, art and a ride in his tank!!!

Guests paid $50k a head to attend the event. Sylvester Stallone, Danny DeVito and Dolph Lundgren, along with the costars of Arnold's new Netflix show, "FUBAR," all showed.

And this part's amazing ... the charity just opened a school program in Uvalde, Texas, at the request of the City. It only took 45 days to get the program up and running.