Now Playing: Inside the #GainingWeightIsCool fitness trend
Now Playing: Instagram fitness star shares her workout secrets live on ‘GMA’
Now Playing: My Morning Routine: This fitness trainer and mom shares her #MorningGoals
Now Playing: Mom’s viral workout video inspires millions as she vows to lose 451 pounds
Now Playing: Michael Strahan gets hooked up to a machine that simulates labor pain
Now Playing: ‘Dry January’ challenge mocktails
Now Playing: How ‘Dry January’ can change your life
Now Playing: CDC reports 20 states experiencing high flu activity
Now Playing: CDC reports sharp increases in number of influenza cases
Now Playing: Tainted drugs: When medicine makes patients sicker
Now Playing: New, single-dose flu medicine now available in US pharmacies
Now Playing: ‘Thriver Thursday’: 12-year-old boy overcomes barriers
Now Playing: How 2 women each lost half their body weight
Now Playing: ‘GMA’ January Challenge: Amy Robach on her love of running and how to get started
Now Playing: Rocco DiSpirito’s tips for healthy cooking in 2019
Now Playing: How 4 relatives lost more than a combined 400 pounds
Now Playing: Best diets for 2019 revealed
Now Playing: My Morning Routine: How CrossFit athlete Brooke Ence begins her day
Now Playing: How meditation can help you in 2019
Now Playing: How meditation can help you in the new year