Kim Kardashian, Kanye West hit Barry's Bootcamp together

This is one hot workout duo!

Kim Kardashian and Kanye West sweated it out together at a 6:30 a.m. class at Barry's Bootcamp in Sherman Oaks, Calif., on Friday.

Both clad in black workout gear, the new parents were "sweet and encouraging toward each other while working out," a witness told us.

According to our source, a "fit"-looking Kardashian, who welcomed daughter North West on June 15, put a "lot of effort" into the class, which is known for being hard-core. Meanwhile, the rapper took it a "little easier" after telling the instructor he was feeling a little sick.

"They looked great -- especially for 6 a.m.," said the spy.