The Bowflex SelectTech 552 dumbbels could be a good option for a person who's getting started with fitness. The weights start at only 5 lbs and are very easy to configure.
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Pros
Pro They're suitable for beginners
The weights of the dumbbells start from 5 pounds, which is a good starting point for people who are only getting into fitness.
Pro Changing the weights is very easy
Changing the weight of the dumbbell is as easy as turning the knob to the desired number.
Pro You can get a dumbbell stand
For extra $100 you can get a stainless steel stand for your dumbbells.
Pro Weights are available in kilograms and pounds
Depending on which measurement system you're familiar with, you can get Bowflex SelectTech 552 measured in pounds or Bowflex SelectTech 552i - in kilograms.
Pro There's a trial period
If you aren't satisfied with the dumbbells during the first 6 weeks of use, you can send them back and receive a full refund, no questions asked.
Cons
Con They're not very durable
You should avoid dropping these dumbbells on the ground because they have a lot of plastic parts that could break.
Con The price may seem too high for a beginner
You have to be prepared to pay over $250 for a pair of dumbbells, which may seem steep for a person who's just considering getting into fitness.
Con Only sold in pairs
You can't get a single dumbbell, which would be cheaper.