meaning of 'worked our asses off' and 'I'll have to check it out'

[kjc0123]

What are the meanings of meaning of 'worked our asses off' and 'I'll have to check it out' in the following sentences?

"Do they have gyms and such?" Ray asked, aiding the conversation. He really didn't want to discuss the perks of various drug tanks. 
"Some do," Forrest said smugly. "Ellie sent me to this place in Florida near a beach, lots of sand and water, lots of sad rich folks. Three days of brainwashing, then they worked our asses off. Hikes, bikes, power walks, weights if we wanted. I got a great tan and dropped fifteen pounds. Stayed clean for eight months." 
In his sad little life, everything was measured by stints of sobriety. 
"Ellie sent you?" Ray asked.
"Yeah, it was years ago. She had a little dough at one point, not much. I'd hit the bottom, and it was back when she cared. It was a nice place, though, and some of the counselors were those Florida chicks with short skirts and long legs." 
"I'll have to check it out." 
"Kiss my ass." 
'Just kidding." 

[Ouisch]

"worked our asses off" - they were put through a vigorous physical work-out.  Not quite the Bataan Death March, but enough activity to tire one out, make them perspire, etc.

 

"I'll have to check it out" - He was intrigued by the description of this place in Florida, and thought he might visit it to see for himself if it was everything it was described to be.

[Peter Pedant]

its arse in English, and ass in American.

or butt - as in working your butt off.

ass is a donkey in English and so are you ready for a pun kjc ?

Greatest example of elasiticity was when Christ tied his ass to a tree and walked into Jerusalem......

Nice to see you back kay-jay