This bodyweight core workout is a high-repetition abdominal routine designed to strengthen and define your entire midsection. Using straight sets and no equipment, it targets the upper abs, lower abs, and obliques while also engaging deeper stabilizing muscles like the transverse abdominis. With 3 sets of 20 reps per exercise, this workout emphasizes muscular endurance, core control, and time under tension. It’s ideal for beginners looking to build foundational strength as well as intermediate trainees who want a focused ab finisher at home.

"Floor Crunches" primarily target the rectus abdominis, especially the upper portion. By keeping your lower back pressed into the floor and lifting your shoulder blades just a few inches off the ground, you maximize tension on the abs while minimizing strain on the neck. Avoid pulling on your head with your hands and focus on curling your ribcage toward your pelvis. This exercise establishes the foundation of the workout by pre-fatiguing the anterior core and reinforcing proper spinal flexion mechanics.

"Lying Bottoms Up" shifts emphasis to the lower portion of the rectus abdominis and hip flexors. From a lying position, lift your hips off the ground by driving your legs upward, focusing on posterior pelvic tilt at the top. The key is to avoid swinging your legs or using momentum. Move with control and squeeze your lower abs as your hips rise. This movement complements crunches by challenging the lower fibers of the abs and adding a pelvic lift component for more complete abdominal activation.

"Alternate Oblique Crunches" bring rotational movement into the workout, targeting the internal and external obliques while still engaging the rectus abdominis. As you crunch upward, rotate your torso to bring one shoulder toward the opposite knee. Keep the motion controlled and deliberate rather than rushing through reps. This exercise enhances rotational strength and improves overall core balance, helping develop a more defined waistline and stronger rotational stability.

"Criss Cross Leg Raises" combine lower-ab engagement with oblique activation. As you raise your legs, cross them over one another in a controlled, alternating pattern. Maintain a slight posterior pelvic tilt to keep your lower back pressed into the floor and prevent arching. This movement increases time under tension for the lower abs while adding coordination and stability demands, making it an effective finisher for the midsection.

Overall, this workout delivers comprehensive abdominal training with no equipment required, making it perfect for home workouts or as an add-on to upper or lower body sessions. Rest 30–45 seconds between sets to maintain intensity and core engagement. Perform this routine 2–4 times per week, depending on your training split. Before starting, include a brief warm-up such as light cardio and dynamic torso rotations. To progress, slow down the tempo, increase reps, add an extra set, or incorporate weighted variations over time. Consistency and controlled execution will lead to improved core strength, endurance, and visible definition.