That type of training is crazy difficult because there are technically not real rest periods to fully adjust your heart rate; all you have are different periods of low intensity routines, followed by the higher ones, and your heart rate isn't really given ample opportunity to come down. About 4 months ago, I could barely get through 15 minutes. Now I do it once a week, 40-45 mins a superset.
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My delivery experience and beach photoshoot here.
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