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, there’s room to play with the structure of it, according to Thomas. You can do a timed workout (for example, 1 to 3 sets of 30 seconds or 1 minute per exercise with 0 to 2 minutes rest between sets), or you can work by sets and reps (for example, 2 to 4 sets of 12 to 15 reps with 0 to 2 mins rest between sets).
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