When you think of ab exercises, the first one that usually comes to mind is the situp. While the situp is OK when performed properly, there's other options that place less strain on the neck, spine, and lower back, especially for people who spend countless hours sitting or working at a computer. "Spinal flexion," which basically means you sit in a hunched crunched position for too long, is similar to a situp, and over time, can cause numerous problems including poor posture, pain, and decreased performance.
Instead of doing situps give these three exercises a try:
Single-arm Weighted Carries
Pushup Hold Walkouts
For demonstrations and instructions go to page two.