According to renowned fitness coach Dr. Jane Smith, these three exercises are essential for building full-body strength and promoting longevity:

1. Squats:
   • Engages multiple muscle groups
   • Improves lower body strength and core stability
   • Enhances functional movement for daily activities
2. Push-ups:
   • Strengthens chest, shoulders, triceps, and core
   • Improves upper body endurance
   • Can be modified for different fitness levels
3. Deadlifts:
   • Works the entire posterior chain
   • Builds overall strength and power
   • Improves posture and reduces risk of back pain

Dr. Smith emphasizes the importance of proper form and gradual progression when incorporating these exercises into your routine. Consistency and a balanced approach to fitness, including cardiovascular exercise and flexibility training, are key to long-term health and longevity.