Are Kettlebells a Hack for Triathlon Strength Training? A huge reason people reach or fall short of these goals, she says, is in their strength training routines. She has her athletes doing strength work two to three times per week, with the focus of each session depending on the time of year. “We just want to make sure you’re moving well so you can support the training you’re doing,” she says. “They’re such a great tool when it comes to strength training,” she says.