Mark Wright, Scott Thomas and other hunky celebs thrilling fans with topless heatwave workouts

THE high mercury isn't the only thing getting people hot under the collar as fans' temperatures soar thanks to hunky celebrities and their topless workouts.

Stars such Mark Wright, Josh Wright, Greg O'Shea and Scott Thomas got their kits off to pump some iron on the hottest day of the year in the UK.

Former Towie star Mark Wright got sweaty alongside his brother Josh in his home gym as the pair showed off their impressive abs.

Mark, 33, and Josh launched his Train Wright company last month and has been making programmes for fans.

"Me and the bro, getting it in and getting it done," Mark said in his Instagram stories, and added of his brother's physique, "ripped to shreds".

He then treated himself to a Piña Colada smoothie - made up of coconut milk, pineapple, banana and a "squeeze of lime" - Mark described it as "absolutely sensational".

Love Island champ Greg O'Shea started his morning off with an intense AMRAP - as many reps as possible - session.

Despite having worked out "three times yesterday", got a "kick up the arse" after listening to a Joe Rogan podcast, so the rugby union player toiled through bike sprints, full burpees and pull-ups.

The 25-year-old wore a baseball cap backwards and just a pair of black shorts as he sweated his way through the gruelling work out.

No stranger to working out in the sun, Love Island's Sam Beattie did a weight session in his backyard at 1pm.

Wearing nothing but red shorts, the star burpeed and lifted weights until he was glistening with sweat.

He showed off his hard work by scanning his phone up and down his abs to post on his Instagram stories.

Singer Sam Callahan revealed the trick to not looking sweaty in workout selfies and that's to take the pics before doing the workout.

He finished up "the best session" at an outdoor fitness training centre in Essex.

Another Love Island star to ditch his clothes and get pulses racing on the hot day was Scott Thomas.

The PR guru listened to some Tupac in his car to motivate himself before his outdoor workout in sunny Manchester.

Before dropping to the ground for some hardcore weight work, Scott took a moment to lower his grey shorts to show off his six-pack to his fans.

But he explained the sexy selfie was not to show off but because he was "buzzing off what I've achieved".

"I think it's important to celebrate your wins, but I wanted to prove every other skinny man out there, string beans that if you work hard you can achieve your goals."

The reality star has turned his life around after his drinking problem nearly cost him his business.

Scott runs Manchester firm the Social PR but in a frank confession on Instagram he’s told how his love of alcohol was affecting his life.

He’s now gone six months without booze after an incident at Christmas which forced him to jet off on holiday on his own to tackle his demons.

Scott revealed: “Last year at Christmas, I had a blow out that nearly cost me a client, it nearly cost me my business, my relationships with my team, my business partner and basically these blow outs, my body was telling me ‘this isn’t for you anymore. You are capable of so much better and every time you want to go out and drink, I’m going to punish you’.”

He added: “There’s no way I was losing the business that I worked so hard for and I wasn’t letting this demon jeopardise that any more."