Spring Fever is a light cardio workout with the exact energy of the first warm week of the year: everything wants to move, nothing wants to suffer. Jumping jacks, pacer steps and curtsy lunges - three bouncy, lateral, good-mood movements arranged into a set that raises your pulse the way spring raises sap: steadily, cheerfully, and without asking permission. It's the workout equivalent of opening every window in the house.

The circuit runs without rest between exercises, and pacer steps are the pollen in the air - they appear three times, threading the whole set together. The structure alternates vertical and lateral demands: jumping jacks bounce you up and open, pacer steps shuffle you side to side in a low athletic stance, and curtsy lunges cross one leg behind the other to load the glutes and lateral hips through a range straight-ahead training never touches. That constant switching of movement planes is the quiet cleverness here - the legs get worked front-on, sideways and diagonally in a single pass, while the pace stays light enough to hum through. Nothing spikes. Everything accumulates, the way a warm afternoon does.

Keep jumping jacks springy and full, arms sweeping all the way overhead. In pacer steps, stay low with knees bent and weight on the balls of your feet, shuffling with quick, small steps - the stance is doing more work than it looks. Step curtsy lunges well behind and across, keeping the front knee pointed forward and hips square, then rise with a spring you can blame on the season.

The fever has one known cure, and it's moving. Congratulations - you've just self-medicated responsibly.

Make it Harder: Double every pacer step block to 20.

Make it Easier: Step the jacks as half jacks and swap curtsy lunges for regular reverse lunges.