Strength-training intervals are pretty polarizing: You either love them or you hate them—there are few that fall in-between. Many of us consider intervals to be the holy grail of ramping up fitness fast (and make no mistake—they do!), but if you fly the flag of Team Anything-But-Intervals, we have a workout for you.

The key to gaining endurance from this strength circuit is going immediately from one exercise into the next with no recovery between sets. This keeps your cardiovascular system working hard from beginning to end without any intense, eye-crossing efforts.

“This is an endurance plus strength circuit combined, a brutal workout (in a good way!)” says Ela Dugan, a certified personal trainer and nutrition coach in Cambridge, MA. “Keeping your heart rate elevated for the entire circuit challenges your aerobic capacity.”

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