Pumping iron! Union J's Josh Cuthbert exhibits his bulging biceps as he's put through his paces by personal trainer during a gruelling park workout

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He's planning a return to the charts this year with his X Factor formed band Union J, after George Shelley quit earlier this year.

And Josh Cuthbert ensured he looked the part for the big comeback as he pumped iron during a gruelling workout on London's Clapham Common with his personal trainer, Martin Bugaj, on Tuesday.

The 24-year-old singer looked completely focused as he was put through his paces in a series of challenging activities, which included weight training, resistance exercises and cardio.

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Time to exercise: Union J's Josh Cuthbert, 24, pumped iron during a gruelling workout on London's Clapham Common with his personal trainer, Martin Bugaj, on Tuesday

The boyband hunk - who is undergoing a three month body transformation - looked dedicated as he showed off his bulging biceps while lifting weighs.

Josh scrunched up his features as he pushed through the pain.

The Select Model Management signed hunk moved on to upper body training as he impressively executed a series of push-ups on two parallel bars.

In the quest to hone his muscular physique, Josh then tried his luck at difficult pull-ups.

Pumping iron: The boyband hunk - who is undergoing a three month body transformation - looked dedicated as he showed off his bulging biceps while lifting weighs

No gain, no gain! Lifting the heavy weights over his head, Josh scrunched up his features as he pushed through the pain

Body transformation: The Select Model Management signed hunk later moved on to upper body training

Although being left red in the face and struggling, the handsome star came back to the surface where he opted for a sprint through the park. 

His personal trainer showed support by keeping him company through the cardio portion of the workout. 

The former football player was then challenged to resistance training in the form of bicep curls with a stretchy band, before ending with another number of push-ups on two bars. 

Despite the tiring nature of his day's activities, Josh ploughed through and looks well on his way to perfecting his dream body. 

Skilled: Josh impressively executed a series of push-ups on two parallel bars

Hard: The star powered through the difficult workout challenge

Making full use of surroundings: In the quest to hone his muscular physique, Josh then tried his luck at difficult pull-ups

Exhausted: Josh was left red-faces as he struggled with the activity 

On the run: The handsome star opted for a sprint through the picturesque London park

Meanwhile, Josh and his band Union J signed with a new management this year and are set to release their eagerly anticipated third album, which was recorded in Los Angeles in May.

Former Stereo Kicks member Casey Johnson was announced as George Shelley's replacement after he left the band in May.   

Meanwhile, the You Got It All singer is loved up and got down on one knee to propose to model girlfriend Chloe Lloyd whilst the pair enjoyed a romantic gondola ride in Venice, Italy, last year.

Captioning a photograph of the stunning ring on Instagram, she wrote: 'My best friend and soulmate totally got down on one knee on a Gondola in Venice and I obviously said YES!'

You can do this! Josh's personal trainer showed support by keeping him company through the cardio portion of the workout

Pushing himself: The former football player did another set of pull-ups on a post 

Gruelling: He puffed in pain as he took on the difficult challenge of raising himself up

Honing his muscles: The former sportsman was then challenged to resistance training in the form of bicep curls with a stretchy band

Correct stance: In order to achieve maximum impact, Josh leaned as far back as possible 

On top: He ended with another number of push-ups on two bars

Going good! Martin looked impressed by his client's athletic capability 

She added: 'Erm whaaaaaat!!!!! I really wish I had the champagne emoji right about now…. I love you @joshcuthbert_uj (sic).'

Whilst Josh uploaded a photo of the pair on the gondola and added: 'SHE SAID YES!!! ???? happiest/luckiest guy in the whole world. 'I love you @chloelloyd.'

Speaking in an interview with HELLO! magazine at the time, Josh said of his romantic Venice proposal: 'I had wanted to ask her for a long time but it was all about finding the right moment. 

'I was hardly likely to find a better backdrop than aboard a gondola in Venice.' 

Chloe admitted she was in tears as the Carry You hit-maker pulled out a heartfelt letter detailing his eternal devotion to her.

Smitten: Josh in engaged to model Chloe Lloyd after getting down on one knee while the pair enjoyed a romantic gondola ride in Venuce, Italy, last year

'Before he even popped the question, he gave me a handwritten letter on beautiful stationery, telling me how much he loved me and how he couldn’t imagine life without me.

'As soon as I started reading it I became aware that he had gone down on one knee and was asking me to marry him. I was so surprised and overwhelmed. We both cried.' 

Chloe soared to success at the age of 17 after she won a competition to be the face of Bank clothing.

Model babe: Chloe soared to success at the age of 17 after she won a competition to be the face of Bank clothing