Core work is crucial for stability of the spine. If you're a beginner - cut the times in half, or start out with :15 per exercise.
30 Swiss Ball exercises to develop strength, balance, core stability. These Swiss Ball exercises are effective in improving your core and lower back strength.
This 25-minute fat-blasting treadmill workout is actually fun! Lose weight and tone up with this super fast and easy routine.
plus bicycle crunches
Whittle Your Middle With the All-Abs Workout
10 Effective Morning Yoga Poses To Give You An Energetic Start
Neila Rey's Five Minute Plank Workout:
Abs of steel
Lose Belly Fat With Just Two Exercises | Men's Health
Couch Abs Exercise...