Training with weights and elastic bands are both effective forms of resistance training, but they differ in several ways. Here are some key differences between the two:

1. Type of Resistance:
   
   • Weights: Traditional weight training involves lifting free weights (dumbbells, barbells, kettlebells) or using weight machines that provide resistance through a stack of weights.
   • Elastic Bands: Elastic bands provide resistance through tension. The resistance increases as the band is stretched.
2. Resistance Profile:
   
   • Weights: The resistance with weights is typically constant throughout the range of motion. For example, if you are lifting a 20-pound dumbbell, the resistance remains 20 pounds from the bottom to the top of the lift.
   • Elastic Bands: The resistance with bands can vary depending on the degree of stretch. It increases as the band is stretched, providing a different resistance profile compared to weights.
3. Joint Stress and Control:
   
   • Weights: Weight training often puts more stress on the joints, especially with heavier loads. Proper form and control are crucial to avoid injury.
   • Elastic Bands: Bands are generally easier on the joints as the resistance is not as abrupt, and there is less impact. They also allow for a more natural range of motion.
4. Versatility:
   
   • Weights: Weight training offers a wide range of exercises and variations, and it’s easy to adjust the resistance by changing the weight.
   • Elastic Bands: Bands are highly portable and versatile. They can be used for a variety of exercises and are convenient for home workouts or travel.
5. Muscle Activation and Stabilization:
   
   • Weights: Weight training often requires additional stabilizing muscles to support the movement, leading to greater muscle activation.
   • Elastic Bands: Bands can engage stabilizing muscles as well, but they may also challenge stability in a different way due to the variable resistance.
6. Progression and Resistance Adjustment:
   
   • Weights: Progression typically involves increasing the weight lifted, which may require purchasing additional equipment.
   • Elastic Bands: Progression can be achieved by using thicker bands or increasing the length of the band for more resistance. Bands provide a scalable resistance without the need for additional equipment.
7. Safety and Accessibility:
   
   • Weights: Using heavy weights without proper form or supervision can pose a risk of injury.
   • Elastic Bands: Bands are generally safer and more accessible, especially for beginners or individuals with joint issues. They can be a good option for rehabilitation exercises.