WATCH: Semenya slams critics, stars in touching Nike ad

Cape Town - Nike has honoured South Africa's 800m Olympic and World Champion Caster Semenya with her very own #justdoit campaign to celebrate the 30th anniversary of their famous slogan.

Following adverts for controversial American footballer Colin Kaepernick - as well as sporting legends like tennis star Serena Williams and basketball legend LeBron James - the American sportswear giant has now included Semenya.

On Sunday, Semenya raced to her 29th consecutive 800m win over a three-year period when she won the event at the IAAF Continental Cup in Ostrava. 

The 27-year-old recently appealed to the Court of Arbitration for Sport (CAS) to challenge upcoming International Athletics Federation (IAAF) rules on testosterone levels in female athletes. 

READ: IAAF to Semenya: Lower testosterone levels, or quit

These rules are scheduled to go into effect in November 2018 and would require Semenya to take a tablet to lower her naturally occurring testosterone levels.

But in the Nike advert, she is as feisty as ever.

"Will it be easier for you if I wasn't so fast? Will it be simpler if I stop winning? Would you be more comfortable if I was less proud? 

"Would you prefer if I hadn’t worked so hard? Or just didn't love it? Or stopped at my first steps?

"That's too bad, because I was born to do this…"

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