Cardio & Core is exactly the partnership it advertises, run three times per set. Every round opens with the same one-two - ten high knees, ten climbers - and then closes with a low-rep core challenge that changes each time: climber taps in round one, plank walk-outs in round two, plank leg raises in round three.

The repeating pair is the engine. High knees spike the heart rate standing, climbers keep it climbing from a plank, and by the third round the cumulative sixty reps have done the cardio half of the job thoroughly. The rotating finishers are the clever part: each one is only two reps, which sounds like a joke until you meet them tired. Climber taps demand cross-body coordination in a fatigued plank. Plank walk-outs travel hand over hand from standing to plank and back - a full-body control test disguised as a transition. Plank leg raises finish the set by loading the glutes and lower back while the shoulders hold everything up. Two perfect reps of a hard exercise beat ten sloppy ones, and this workout is structured entirely around that truth.

Keep the high knees tall and springy and the climbers low-hipped and full-range - the pair only works if both halves stay honest. Make the two-rep finishers deliberately slow: walk your hands out with control, raise each leg without tilting your pelvis, and treat every rep as a form demonstration rather than a formality.

Cardio brings the heat, core brings the control. Three rounds, and the partnership holds.

Make it Harder: Turn every two-rep finisher into five.

Make it Easier: March the high knees and perform the finishers from your knees.