Contreras (hamstring) participated in agility drills and caught for teammate Jake Arrieta on Wednesday, Jesse Rogers of ESPN.com reports.
Contreras' workout Wednesday included sprints and additional running drills. He did a similar workout Tuesday, so seeing him be able to increase his level of activity in such a short amount of time is certainly promising. If he keeps his current pace, a mid-September activation from the disabled list should be in order for Contreras. Until then, Alex Avila and Rene Rivera will share time in the Cubs' lineup.