No Equipment Ab Exercises
InorganicBlog - Business, Tourism and Technology: Abs Workout for Men at Home without Equipment
Abs Pro Workout
Ladies, don't think "these exercises are for men" just because a man is drawn on them. These will work for you perfectly fine too!
Neila Rey's Five Minute Plank Workout:
Ripper Core Workout: Do this Ripper Core workout after your cardio sessions, run workouts, or cycle class to strengthen your core and get those abs in tip top shape.
Visual Workout Guides for Full Bodyweight, No Equipment Training - Karma Jello