And why "strong core" doesn't equal "flat abs."
Want a stronger core – skip the sit-ups - Harvard Health
To improve your health and fitness as you age, try this 2 or 3
Do more for your core - Harvard Health
Core Stability Exercises for Runners: Why You Need Core Stability
10 Benefits of Squats and Which Muscles They Strengthen
5 of the best exercises you can ever do - Harvard Health
15 Best Exercises for Strengthening Your Back – Everlasting Comfort
Understanding and improving core strength - Harvard Health
Wearable weights: How they can help or hurt - Harvard Health