Outlander heartthrob Sam Heughan set pulses racing with his recent Instagram update, where he took on a chilling challenge. The Starz idol thrilled his 4.3 million fans with sizzling snaps from his visit to the Thermal spa in Glasgow for a bracing cold plunge.

The 44-year-old actor, accompanied by fitness coach Valbo, wasn't shy about diving into the icy waters, evident in the steamy shots of him emerging from the chill. Unfazed and grin intact, Sam plunged while Coach Valbo seemed to battle the bite of the cold as he clenched his fists. Not shying away from a witty caption alongside the tantalizing photos, Sam posted: "Things are heating up (cold face emoji) @thermal_gla!!? Some post @mypeakchallenge workout recovery with Coach @valbo00.

" (sic) As expected, the comments exploded with praises and envies. Fans swooned over the rugged TV star with one gushing: "He could wear a potato sack and look perfect. OMG.

" (sic) An admirer wrote: "It looks like it feels good. Your smile is lovely." While someone else couldn't hold back, exclaiming: "Amazing! You look like you're having fun.

.. in cold water (laughing emoji).

" (sic) Brightening days seems to be a speciality for Sam, as a fan chimed in: "Well that's cheered me right up." Another gushed: "You are so damn cute!" (sic) Amidst the wave of adoration for Heughan, the cold therapy received its fair share of applause too, with one enthusiast remarking: "The best place in the world: the thermal baths!" Even more fans poured in with t.