Flybird makes great quick-to-adjust dumbbells though the lightest weight that these can go is 15 pounds (going all the way up ...

You adjust these weights by lifting levers on the plates ... over-the-top testing so you can make quick and confident buying decisions. Whether it’s finding great products or discovering helpful ...

But the downside is you can't just pick up a different weight; you have to adjust them. This means time away from your training as you manually remove or add plates. That's not true for all dumbbells, ...