This one’s about movement and speed. The core cardio HIIT workout  fuses heart-pumping intensity with core control — perfect as a finisher or standalone quick burn. The Workout Format: 30 seconds per move 15 seconds rest between 3 rounds total 1-minute rest between rounds Moves: Mountain Climbers Cross-Body Mountain Climbers High Plank Toe Taps Benefits of This Core Cardio HIIT Workout Mountain Climbers:  Boost cardio and strengthen hip flexors. Cross-Body Climbers:  Add rota