updated 07/11/2011 AT 11:00 AM ET
•originally published 07/11/2011 AT 11:45 AM ET
Russell Crowe is getting into shape, 140 characters at a time.
The New Zealand-born Aussie Oscar winner, 47, has been Tweeting his exercise routine, kicking off his summer of fitness with a bike ride on June 18.
“First ride in quite some time. Sore legs, sore a**, be worse tomorrow and the next day,” Tweeted Crowe.
The actor, who gained 63 lbs. for 2008’s Body of Lies, confessed to struggling with maintaining his physique.
“If i stop exercising my body tries 2 return 2 its heaviest weight,” he admitted to a fan. (Spelling Crowe’s.)