Sports Illustrated reveals its 2017 lists of the world’s fittest athletes. The magazine received input from a panel of trainers, strength and conditioning coaches and performance experts. Athletes were considered based on performances in the last 12 months, demands and risks of their respective sports, training regimens, longevity and physical benchmarks, including: speed, strength, endurance, agility, flexibility and power.

Here’s who cracked the top 10 on the men’s and women’s lists:

1. Cristiano Ronaldo, soccer
2. LeBron James, basketball
3. Roger Federer, tennis
4. Mat Fraser, weightlifting
5. James Harrison, football
6. Odell Beckham Jr., football
7. Russell Westbrook, basketball
8. Wayde Van Niekerk, track and field
9. Conor McGregor, mixed martial arts/boxing
10. Jordan Burroughs, wrestling

1. Simone Biles, gymnastics
2. Allyson Felix, track and field
3. Katie Ledecky, swimming
4. Maggie Steffens, water polo
5. Tia-Clair Toomey, weightlifting/CrossFit
6. Claressa Shields, boxing
7. Nafissatou Thiam, decathlon
8. Helen Glover, rowing
9. Serena Williams, tennis
10. Lindsey Vonn, skier

Most Fit Athletes in Sports on SI’s Fittest 50 List |