Use the "2 for 2" rule when deciding if it's time to increase the amount of weight you're lifting: When you can do two more reps with a given weight than you started out with for two consecutive workouts, increase the weight.Jul 8, 2021
How can I bulk up my dumbbells at home?
https://www.youtube.com/watch?v=xQ2nXrkSOAI
Do I need to increase dumbbell weight?
If you can do 15 reps* of an exercise (in good form) with your current dumbbells without any strain or trouble on the last few, then it's time to increase. If you have been working out for several months consistently and haven't increased weight, then it's time to!
Is it better to have two dumbbells?
They are often sold in pairs so just go for it. Another reason is general efficiency during the workout. If working two arms, it is quicker if you don't need to move a DB around. Finally, with 2 you get some redundancy.
Is it OK to use uneven dumbbells?
When you train with uneven weights the difference should not be too extreme, with kettlebells as a general rule 4kg/8.8lbs difference is good. But, it will also depend on what exercise you're performing and how conditioned you are to that exercise and weight difference.
Can you bulk with just dumbbells?
You can absolutely bulk up with dumbbells, but you're going to hit a wall if you don't keep adding weight. If you just lift the same 20 lb (9.1 kg) dumbbells for a year, you're certainly going to stronger, but you won't get huge muscles. You need to use heavier weights as you get stronger to keep bulking up.