President Donald Trump was joined by professional athletes on Thursday as he signed an executive order that will expand on his council on sports, fitness and nutrition, including by reviving the Presidential Fitness Test in public schools.

President Donald Trump announced the return of the Presidential Fitness Test, a historic physical health challenge first introduced by President Eisenhower and later canceled under President Obama.

The test was conducted in U.S. public schools for decades until it was retired by the Obama administration. Here’s what to know about it and why Trump wants it back.