Haim's Alana now has to stretch before every concert because her joints are starting to ache now she's in her 30s.

The American rock band - comprised of sisters Alana Haim, Este Haim and Danielle Haim - have built a reputation as a ferocious live band and Alana, 33, has now revealed that her pre-gig ritual has had to change from when they started out as teenagers because she has to limber up to ensure she isn't in pain after coming off stage.

Discussing how Haim have no intention of slowing down in the wake of the release of their fourth album I Quit, she said: "It feels like we have so much more to accomplish, this doesn't feel like anything other than a beginning again.

"All of us still feel like we're 16, and nothing gets old. Actually, the only thing I have to do now is stretch before a show. That's new, I've got to give a little stretch, because, the joints…"

Haim played a secret set at the Glastonbury Festival last weekend which earned them rave reviews, and they are heading out on their I Quit Tour this September.

The If I Could Change Your Mind hitmakers believe their live shows are unparalleled because they still have the mentality of a support band who want to "win the crowd over".

In an interview with the July edition of Music Week, singer-and-guitarist Danielle said: "We started our band, playing in LA, opening up for our friends and for the first five years, we just played any gig we could.

"We continued to open up for some of our favourite bands and it kind of feels like we've opened up for everyone, but that's it, every time we go on stage, even when we're headlining, we have opener mentality. We always want to win the crowd over. We always want everyone leaving our show feeling, 'wow, you know, Haim gave it their all.' We take it very seriously. We go up on that stage to give our fans the best show ever."

Guitarist-and-vocalist Alana won't let anyone hug her after a concert because she is always drenched in sweat due to the energy she expends playing.

She said: "With the I Quit tour, we want people to leave and just feel extremely energised.

"We really do give it our all. I mean, we are a puddle of sweat. If anyone tries to hug me after a show, I'm like, 'Please don't. I smell and this is not okay!'

"We're a live band. We love being in the studio, but from the very beginning, we've always considered ourselves a live band. That's where that's where the magic happens for us."