
Some are stronger than others. What is "heavy" for you may be lighter to another. It is possible to have two individuals who weigh the same amount, whether the same height, and have the same musculature……, and one can be much stronger than the other.
So do not compare or worry about how much someone can lift.
Enfócate in their own strength.
How much weight should be used to lift?
Always keep in mind that in every series, no matter which exercise, want to complete between 6 or 7 repetitions initially, (then complete the process of rest for 10-15 seconds, 1-3 to make more repetitions, rest again, etc.). . So, you need to select an amount of weight you permet this.
If you choose a very heavy, you can not complete 6 repetitions. If you choose a very light, then you will be able to do much more than 6 or 7 repetitions.