Now Playing: Mom's Get Real: The Death of Recess?

Now Playing: Ricki Lake Takes on Childhood Obesity

Now Playing: This therapy dog is tiny but has a huge impact

Now Playing: Tips to throw a memorable Memorial Day party

Now Playing: Rashad Jennings offers advice on how to succeed in dancing and in life

Now Playing: Girls ask Dr. Mae Jemison about space

Now Playing: Trump summit with North Korea in jeopardy

Now Playing: Black woman makes history with election win

Now Playing: Americans' private plane breaks in half in Honduras

Now Playing: Former 'GMA' anchor reveals gambling addiction

Now Playing: How to save money at the pump over Memorial Day

Now Playing: These pool floats will make a splash at your summer BBQ

Now Playing: Sinkholes open in Florida ahead of tropical storm

Now Playing: Writer Philip Roth dies at 85

Now Playing: Cyclist grabs suspicious bag during bomb squad investigation

Now Playing: 30-year-old ordered to vacate parents' home speaks out

Now Playing: 20 volunteers drive missing dog 2,000 miles

Now Playing: Emilia Clarke opens up about 'Solo: A Star Wars Story'

Now Playing: How to pick the best phone mount for your car from Wirecutter

Now Playing: Who's behind the internet's 'youngest flexer,' 9-year-old 'Lil Tay'?