Taylor Swift was determined to get a solid workout in on Saturday, but anyone who passed her on the trail no doubt thought she needed a sandwich - not a sweat session.
The 23-year-old pop star revealed her slender arms and legs while she hiked with friend Ed Sheeran and her bodyguard at Franklin Canyon in Los Angeles.
Dressed in a black tank top and tiny shorts, Swift revealed that she really couldn't afford to lose any more weight while on the challenging trek.
Skinny hiker: Taylor Swift didn't look like she had a pound to lose when she hit the trail at Franklin Canyon in Los Angeles on Saturday
At 5ft 9in, Swift strode confidently ahead of the pack thanks to her agile, long limbs, leaving her hiking partners in her wake.
With black Ray Ban sunglasses keeping out the sun and her blonde hair pulled back in a ponytail, the You Belong To Me singer was happy to get an open air sweat session in sunny California while the rest of the country was shivering.
Poor Ed, 22, trailed behind the country star, no doubt worrying about his pale, English skin getting burned by the unseasonably bright rays.
Hiking buddy: Ed Sheeran kept a few steps behind his leader as he followed Taylor up the trail
With his ginger hair and armfuls of tattoos, The A Team singer looked out of place in the wilderness despite his Adidas shorts and trainers.
Coming up the rear was her burly bodyguard, who dutifully carried a small backpack with provisions for the group.
Taylor and Ed have become close friends since she contacted him after hearing his music while touring in Australia in 2012.
Hurry up! Swift encouraged her cohorts to walk faster so they didn't get left behind
He has since supported her on the Red tour and the pair performed together at Madison Square Garden in New York as part of Ed's own sell-out tour of America on November 1.
'I think that you can love people without it being the great love,' she recently revealed to link
magazine. 'Ed said something that really resonated with me. He says there are different kinds of love.
'There's physical attraction, mental attrition and emotional attraction, there's also comfort and obsession,' Taylor explained.
Bony rib cage: The slender singer's low-cut workout top revealed how thin she has gotten as she took to the hills with her BFF
Work and play: Taylor and Ed have been performing together since 2012, and are close friends both on and off the stage
Three's a crowd: The country singer's bodyguard carried a small backpack as she chatted with Sheeran