The sock entrepreneur has been sporting a slightly stockier frame since splitting from pop starlet Rita Ora last year, but he has been making an effort to beat the ***** and has been spotted out and about on a number of hikes with his pals in recent weeks after revealing his plans to lose 50lbs.
Rob was dressed appropriately for his workout, opting for shorts and a T-shirt in the slimming colour of black, while sheltering the back of his neck from the hot Californian sun with a backwards cap.
The reality TV stalwart pounded the pavements with a pair of bright blue and green trainers, while drying off with a white towel.
Although he was supposed to be on a workout, Rob seemed immersed in conversation with a number of pals for much of the hike, and was spotted chatting and joking away to both male and female friends.
The star is believed to be embracing a new healthy lifestyle, and is thought to be following the 60 Days of Fitness exercise and healthy eating programme advocated by The Game's younger brother BWS Byrd.
Isn't this like his 3rd time losing and gaining weight within a span of 5 years.
Maybe there's a deeper, closeted rooted issue that Rob is suppressing that he needs to set free.