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What Is Peripheral Heart Action (PHA) Training? According to the National Academy of Sports Medicine (NASM), PHA training is similar to circuit training in that you move from exercise to exercise with little to no rest, but with PHA training, you purposely alternate between upper- and lower-body movements. “The blood circulates between your upper and lower body and builds better muscle strength and endurance because you can maximize your efforts—you aren’t maxing out on one muscle group for too long,” Tamir says. While the upper-to-lower-body format of a PHA workout is fixed, ther...

Is PHA Training the Secret to Stronger, Speedier Miles? Danielle Zickl © Trevor Raab This combo of strength and cardiovascular work gives you“big bang for your workout buck.” Here's everything you need to know about this training modality. New workout trends crop up all the time—some, like HIIT and circuit training, catch on for the long haul. Both of these modalities get your heart pumping and your muscles burning, making them the go-to cross-training activities for runners. But there’s another training modality that’s been around for decades and coming back int...