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Who is Caster Semenya? Why appeal loss on IAAF's rules is 'discriminatory' yet 'necessary'

South African runner Caster Semenya handled Wednesday's court ruling the best she could: By posting a helpless emoji and hardly reacting at all.

The two-time Olympic gold medalist in the 800 meters will be forced to follow a similar blueprint as she traverses her running career with a human rights saga attached to it.

The Court of Arbitration for Sport's panel of three judges denied Semenya's appeal against IAAF rules that will force female runners like herself to decrease naturally high testosterone levels in select track and field events as intersex athletes.

USA TODAY Sports unpacks the controversial ruling and why it matters for intersex athletes and the future of the Olympics, including the 2020 Tokyo Games.