Rachel Hunter pulls off impressive yoga pose - wearing just her bikini

is giving

a run for her money. The 44-year-old pulled off a difficult pose in a London park this week, sharing a snap for her Twitter followers to see. Rachel, a mum of two, showed off her

as she contorted her body for the

.

© Photo: Twitter

Wearing just a black string bikini, the body-confident New Zealand model captioned the photograph "

."Rachel, who was

, is based in LA and is regularly pictured going to

there. She has also been a big fan of

for seven years.But true happiness, she says, doesn't come from external beauty.

"It's my job to look good – but

," she recently said in an interview with

."But I definitely look in the mirror and think, 'That could be better.' You let things go a bit more when you're older, don't you? I don't like my jowls – there are always things that can be worked on. And it's a hard decision as to what age you stop wearing a bikini. "

," added the star, mum to Renee, 21, and Liam, 19. "And don't go out in midday sun – the lighting is terrible! Stay under the umbrella between 11am and 2pm. And hey, if I was 20lb overweight, do you think I would be jumping into a bikini on a photoshoot? Hell, no!"

She added, "I always want to tell girls who are obsessed with their weight that

.""It's not that time when you're wearing jeans that you think make you look good, or when you are standing up straighter in those new heels that define sexiness. It's simply when you're exuding inner confidence and feel at peace. When that moment happens, remember it. Being sexy is an internal feeling."