Beyonce sang while running on treadmill as part of Olympics-style training with Destiny's Child

Beyonce sang while running on a treadmill as part of her Olympics-style training with Destiny's Child.

Her former bandmate Michelle Williams, 43, said the gruelling stage and exercise combination was encouraged by Beyonce's dad Mathew Knowles, 70, who used to manage the R and B group.

Michelle told Australia's KIIS FM: "That was training for all the girls in Destiny's Child.

"He (Mathew) was a great coach. I would liken him to a coach who wanted to make sure his team gets the championship."

Destiny's Child, which also featured Kelly Rowland, were formed in Houston, Texas, and debuted in 1997 with the single No No No before disbanding in 2006 after racking up sixty million in global record sales.

They have reformed for several life performances, including the Superbowl in 2013.

Michelle talked about her past in band after she was unmasked on the Australian version of The Masked Singer on Tuesday night (Aug 23).

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Former Spice Girl Mel B was left speechless after she managed to guess the singer's identity, exclaiming: "I knew I knew that voice. I knew it. I knew it. You are amazing."

Michelle replied: "From one girl group to another girl group who is the blueprint who paved the way.

"The times when we were in London, all those times in the early 2000s, we would be meeting everybody, but not the Spice Girls!"

Michelle also said the significance behind her performance of Say Something by A Great Big World and Christina Aguilera was down to her break up last year with fiance Chad Johnson.

She said: "It's no secret I was engaged and it did not work out. I just remember those words. It kind of articulated this is what I've been wanting to say.

"It's until you really emote it in full voice, it was almost like therapy. And so it just came out in that way. That's what music can do to you when you just let it go."