Celeb Trainer Gunnar Peterson’s Daughter, 4, Has Leukemia [Video]

The four-year-old daughter of celebrity trainer Gunnar Peterson has leukemia, and is currently undergoing treatment. 

Peterson, who has worked with stars like Khloé Kardashian and Jennifer Lopez, shared the news in an Instagram post Wednesday that his daughter, Monroe Vivian, had been diagnosed with acute myelogenous leukemia (AML Leukemia), which the Mayo Clinic says is cancer of the blood and bone marrow.

“This is going to be longer, and cathartically different from my usual fare. Forewarned is forewarned. Life changing turn,” Peterson began his post, which featured photos of his family with Monroe in the hospital.

“Our perfect 4 year old daughter, Monroe Vivian Peterson (MVP, see that?!) had a nagging cough, on and off fever, and an odd pallor to her for a few days last week. Typical kid stuff.”

When his wife Jess noticed bruises on Monroe’s legs, Peterson said she took their daughter to the hospital, as the bruising “was odd since she hadn’t …