[Closed] alternative to "lung busting"

heart attack inducing 😀

ball shriveling

killer

cheek-puffing, chest-raping, bonk-inducing

lactic acid meltdown inducing?

sphincter puckering

gut wrenching? Thigh burning? Eye watering?

vison blurring

Face melting.

"Push"

erection quelling

evil

so steep you'd need a safety line to climb back down

"Long and Hard"

😀

vomitous

c_nt of a

Blowing out of your [s]arse[/s] bottom

Double hard bastard

"A real Jens Voigt of a climb"

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"ring vomiting"

controversially, how about "Hugely Enjoyable" Hills are your friend. Not always immediately welcome, but in the long run, will do you soooo much good. Learn to love them, then seek out bigger and steeper ones....

"Southerner's Nightmare"

Northerner's Wet dream

eg, the slate grey skies failed to inspire the southerner as he ascended double-track across barren featureless moorland. But he knew this type of thing was a Northerners wet dream

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Gurn-tastic, or indeed Gurn-trocious, depending on what side of Watford you live.

Aorta Popping
Asthma Inducing
Chest Heaving
Rib Aching

Oh... and apparently a picture of a fish works as well.

Beast.

alpin, is this marketing for your Germans? I'm sure we could come up with some "don't mention the war" type descriptions if so.
Goose-stepping climb, anyone?

"Consciousness expanding"?

soul destroying
energy sapping
motivation testing

pneumothorax inducing. Happened to me!

c**t of a climb

Murderous

Character building.

widow-maker

Prolapse inducing?

steep?

withering

Helmet rotating