Without cords, plugs and power outlets, the Dolphins' wide receiver charges up his game with elements of CrossFit, a fitness company that has created and popularized a training philosophy that mixes components of plyometrics, gymnastics and powerlifting in intense bursts of multiple exercises. The workout applies the same Olympic weightlifting principles that are more common with his NFL peers.
"I got away from a lot of heavy weights, but I didn't lose power," says Jennings. "With CrossFit training, I got stronger with less stress on my joints."
"When everyone is tired, Greg should be gaining momentum and at his peak performance at the end of a game," says Harris. "We decided he needed to be lighter, faster and more explosive," Harris says.
As a key part of the Miami's receiving corps heading into the 2015-16 season, Jennings also conditions his hands, both at home and in the gym.
“I’m always touching and catching things at home—a tennis ball, an American Girl doll or whatever the case may be—so hand-eye coordination is always at the top of my mind,” says Jennings. “But I’m also constantly working on my grip in the gym.”
Entering his 10th season in the league, Jennings is aware of what methods work best for his body. Harris specifically strengthened Jennings's weaker areas, such as his hamstrings, which are susceptible to wearing out late in the season.
The rapid-fire circuits force Jennings to control his breathing and focus on a task, be it a clap push-up or a sideline catch. His training is tailored to build fourth-quarter fitness, or energy storage for when other players run out of gas.
"Everyone feels the weight of the game and gets fatigued," says Jennings, "but it's all about how you've dealt with it in the past and what you've done to help yourself overcome those mental barriers."
http://www.si.com/edge/2015/07/29/nfl-training-with-greg-jennings-miami-dolphins-crossfit