you should be able to do 8 to 10 reps and when you can do it 8 to 10 times you need to add weight to your bar if you want to gain muscle.
It is harder to lift two 25 pound dumbbells because you have to balance the dumbbells. So it takes more effort, and uses more muscles to help keep the weights balanced.
Dumbbells have changed over the years. It used to be you had to buy a set of dumbbells in weights ranging from 1 pound up. Nowadays you can also purchase adjustable dumbbells. These dumbbells come with extra weights that all attach to the same handle, saving space. When buying dumbbells you also need to consider the size of the person using them. Too heavy of dumbbells can cause serious muscular damage. wwww.livestrong.com can guide you in what size to use.
I would recommend starting with 5-pound dumbbells because according to this site, http://www.wikihow.com/Choose-the-Right-Dumbbell-Weight, it will help you choose the right dumbbell.
you should about 105 pound
25
Thirteen minutes per pound. Two hundred and sixty minutes total.
Yes. Each dumbbell weighs its rated weight, give or take an ounce or two.
This rack can hold any 18 beauty bell dumbbells, weighing 3 through 50 pounds.
it really depends on the strength of the kid, but on average its between 60lbs. to 80 lbs.
5 pounds
The same as the question to a silly answer: Thirteen thrushes and half a pound of asti.
13/100 there is no other way of simplifying this fraction :)