Day 18: 25 MIN TOTAL ABS & CORE Workout - No Equipment (HIIT IT HARD - The Comeback)

This 25‑minute total abs and core workout, designed for intermediate level and requiring no equipment, starts with a 60‑second plank hold to activate the core. It then moves through a series of 30‑second rounds of crunches, leg kicks, flutter kicks, knee‑to‑elbow, reverse crunches, and ab holds, followed by a 60‑second low‑plank challenge. Next comes a 30‑second circuit of sit‑ups, heel taps, body twists, and boat poses, then side‑plank variations and a final 30‑second burn of straight‑leg sit‑ups, tuck‑ups, leg raises, and toe taps. The routine concludes with climbers and a 30‑second cool‑down of downward dog and thread‑the‑needle stretches.