Step by step instructions, muscle activation and variants for the Half Sit-Up.
A controlled abdominal exercise where you curl upward to approximately a 45-degree angle — halfway between lying flat and sitting fully upright. The partial range reduces lower-back stress while still challenging the rectus abdominis and hip flexors.
Common mistakes content is coming soon.
The Half Sit-Up is a foundational movement that builds strength and muscle through controlled, progressive overload. Train it 1 to 2 times per week with 3 to 5 working sets per session, gradually adding weight or reps as form holds up.