by Radar Staff
Wearing a helmet trauma room docs call a "brain bucket," Arnold Schwarzenegger spent Monday morning on his motorcycle in Malibu, and RadarOnline.com has the photos.
Schwarzenegger typically rides with a regular posse of friends and a bodyguard but today Maria Shriver's estranged husband was solo on his Indian motorcycle.
Maria and their children have been at the couple's Malibu house all weekend.
As RadarOnline.com reported earlier, Maria and kids Christina, Katherine and Christopher all hit up their favorite Italian restaurant Sunday night. Christopher, who'd been with them earlier, tweeted that he was on his way to New York.
Shriver kept most of her tweets focused on Memorial Day, and reached out to all the families who'd lost loved ones in military service.
"You have our deepest gratitude and respect," Maria tweeted.