Arnold Schwarzenegger, 72, enjoys a bike ride with girlfriend Heather Milligan, 45

Arnold Schwarzenegger, 72, keeps healthy as he enjoys a bike ride with girlfriend Heather Milligan, 45, around Santa Monica

He’s passionate about fitness and enjoys a bike ride almost daily.

And Arnold Schwarzenegger, 72, took to two wheels again on Sunday, enjoying a leisurely bicycle cruise with girlfriend Heather Milligan, 45. 

Spotted in Santa Monica, a neighborhood adjacent to where he lives, the former politician looked relaxed and showed off his tan in a grey T-shirt and black shorts. 

Memorial weekend outing: Arnold Schwarzenegger, 72, went for a bike ride with girlfriend Heather Milligan on Sunday

Outdoors: The sporty couple were seen enjoying a leisurely cruise around Santa Monica

Outdoors: The sporty couple were seen enjoying a leisurely cruise around Santa Monica

The couple – who have been dating for around seven years – were spotted unloading their bikes from an SUV and cruising down the leafy streets.

Physical therapist Heather looked sporty cropped leggings and a zip-up sweater and covered her head in a baseball cap.

The duo were also joined by Arnie’s good friend Ralf Moeller who often accompanies the Predator star on his outdoor excursions. 

Meanwhile, Arnie has said he’s ‘really looking forward’ to becoming a grandfather.

Pals: The duo were also joined by Arnie's good friend Ralf Moeller who often accompanies the Predator star on his outdoor excursions

Pals: The duo were also joined by Arnie’s good friend Ralf Moeller who often accompanies the Predator star on his outdoor excursions

Longtime companion: Physical therapist Heather looked sporty cropped leggings and a zip-up sweater and covered her head in a baseball cap

Longtime companion: Physical therapist Heather looked sporty cropped leggings and a zip-up sweater and covered her head in a baseball cap

Sunny days: The couple - who have been dating for around seven years - were spotted unloading their bikes from an SUV before cruising down the leafy streets

Sunny days: The couple – who have been dating for around seven years – were spotted unloading their bikes from an SUV before cruising down the leafy streets

The Terminator star will welcome a grandchild into the world when his daughter Katherine Schwarzenegger gives birth to her first child with husband Chris Pratt, and Arnold has said he can’t wait to ‘play around’ with the impending arrival. 

Arnold also confirmed Katherine is due ‘this summer’, but insisted he doesn’t know ‘when exactly’. 

Speaking during an appearance on The Tonight Show starring Jimmy Fallon, he said: ‘Yeah, can you believe that? I mean, that is really exciting news that Katherine now, you know be pregnant and have a baby – I don’t know when exactly. Sometime this summer. 

Sporty: Arnie wore a grey T-shirt with black shorts for the sunny outing

Sporty: Arnie wore a grey T-shirt with black shorts for the sunny outing

Exciting: Arnie has said he's 'really looking forward' to becoming a grandfather when daughter Katherine gives birth this summer. She is pictured with mom Maria Shriver

Exciting: Arnie has said he’s ‘really looking forward’ to becoming a grandfather when daughter Katherine gives birth this summer. She is pictured with mom Maria Shriver

‘And, inevitably, I’m really looking forward to playing around with whatever it is, she or he, and have some fun.’

Katherine was first rumored to be pregnant last month, and sources at the time claimed she and Chris – who already has seven-year-old son Jack with his ex-wife Anna Faris – had kept the news private at first in order to ‘enjoy this time’ for themselves. 

An insider said: ‘Chris and Katherine are so happy. They wanted to enjoy this time privately for as long as possible, but now that Katherine is showing more, they’re excited to share the news with everyone.’