Curl said that, because the sand moves under his feet, doing the same drills that they do on grass but on the beach helps improve foot speed, power and stability in the ankles and knees. Running up inclines aids leg power, knee drive and acceleration.
"He's going to test you for sure," Curl told theRams.com. "You're always going to come out sweating bullets."
Liggin has trained a variety of NFL stars, including some former Rams in wide receiver Odell Beckham Jr. and outside linebacker Von Miller. Curl's group included Diggs, Vikings receiver Jordan Addison, Ravens receiver Rashod Bateman, Seahawks receiver Cody White and Rams defensive back A.J. Green, among others.
The training often caters to players' positional requirements.
"I look at things from a biomechanical standpoint," [Liggin told Men’s Journal in 2020](https://www.mensjournal.com/sports/need-speed-how-trainer-jamal-liggin-transforms-elite-competitors-athletic-gods). "I like to see how you're moving. I like to incorporate their unique movements into the workout."
One of Curl's goals for the upcoming season is to get his hands on the ball more often. Last year, he finished with zero interceptions for the fourth-straight season, but broke up a career-high nine passes, forced two fumbles and recovered another for a 33-yard touchdown.