"It felt awesome," Arrieta said.
With the addition of free agent Jason Hammel, the Cubs' other options for the fifth spot in the rotation include Chris Rusin and James McDonald. McDonald will make his first Cactus League start on Friday against the Angels.
Even though Arrieta is not ready for games, he said he's feeling on track.
"My endurance is ahead of schedule," Arrieta said.
Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter @CarrieMuskat. This story was not subject to the approval of Major League Baseball or its clubs.