POPSUGAR reports on the concept of high-intensity interval training (HIIT) to lose weight and build muscle, how long it will take to see results, and lifestyle factors to consider to get started on the right foot.

PopSugar.com spoke to Jason Machowsky, RD, CSSD, RCEP, CSCS, exercise physiologist at HSS, who explained not only do you need to put in the effort at the gym and make healthier nutritional decisions to see results, it’s important to ensure you’re getting enough sleep and managing your stress. "Being in a high-stress environment is generally not good, especially long term," said Machowsky. Machowsky cautioned that high-stress environments for a prolonged period of time can cause your cortisol levels to increase, which can potentially lead to weight gain. "Typically, when people are stressed, they might tend to eat worse, they make poor decisions, they skip meals, or they don't exercise," cited Machowsky. The same can happen when you're sleep deprived, he added.

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