Hartenstein (ankle) participated in an offseason workout with the Thunder on Monday, Clemente Almanza of USA Today reports.
Hartenstein sat out FIBA qualifiers with Germany to nurse an ankle injury he sustained earlier this summer, so it's encouraging to see him back on the court ahead of training camp in the fall. The 28-year-old big man appears to be firmly on track for the start of the regular season in October, barring any setbacks along the way.