By AMELIA PROUD
The idea behind a sports bra is to batten down breasts while you work out, in fact, most gals like to bind their curves down as much as possible before they get active.
There's never really been any need for a plunging sports bra; unless of course you were just trying to look the part in the gymwear, without working up a sweat.
Not that there's any suggestion that Kim Kardashian, 32, would be more interested in a photo op rather than cardio work but the bra she wore to visit an LA gym on Saturday didn't look very practical.
It was extremely revealing, however, and showed off Kim's knockout cleavage in all its glory.
No wonder then that boyfriend Kanye West, 35, was close by... keeping an even closer eye on the woman he calls his 'perfect b****' (eat your heart out, Keats).
Kanye didn't look kitted out to work out himself in his favourite leather effect trousers and hoodie but perhaps he changed inside.
More likely he was just keeping his one true love company.
The pair are also spending Christmas together as confirmed by Kim's little brother, Rob.
'My mom has a really big Christmas party every year on Christmas Eve,' Rob told E! news.
'We all sleep over at the house, and on Christmas morning we wake up at like 6 a.m. and do presents. They all make breakfast, all the girls. We watch basketball. It's a family day.'