Celebrity trainer Gunnar Peterson shares daughter, four, has leukemia: 'Life changing turn'

Revered celebrity trainer and former Director of Strength and Endurance for the Los Angeles Lakers Gunnar Peterson announced heartbreaking news on his Instagram Wednesday.

The Duke University alum, who has worked with the likes of Sylvester Stallone and the Kardashian family to retired NFL quarterback Tom Brady, shared photographs from a hospital where his daughter is currently receiving treatment. She was diagnosed with acute myeloid leukemia.

"This is going to be longer, and cathartically different from my usual fare.