Ever looked at another guy or girl on the gym and thought, "Whoa! How are they able to lift so much weight?!".
Well, it might be helpful for you to know that all these things are relative and that you might not actually be as far off the pace as you first thought. In Olympic weightlifting competition, allometric scaling is utilised to measure strength levels in relation to body dimension, and is known as the "Two-Thirds Power" rule (Jaric, S. 2002).
The reason behind using this scaling system is that load (kg) lifted does not automatically increase with a rise in body mass, so the standard equation of LOAD/BODY MASS will generally favour the smaller individual, as biomechanics, anthropometrics and geometrics are not taken into account (Stone, MH. 2006).
The "Two-Thirds Power" rule is based around the fact that strength is a 2-dimensional factor and mass is a 3-dimensional factor, so it centres around the principle of geometric similarity between individuals. So if you are interested in finding out where your strength levels are in comparison to the normative data, or if you just want some bragging rights over your gym mates, utilise the "Two-Thirds Power" rule, via the following equation:
LOAD LIFTED (kg) / (BODY MASS x 0.67) =______________
So to see who gets to tell everyone that they're the Arnold Schwarzenegger of the 'Twins" coupling compare the figures you end up with after the equation and see who has the larger number... this will indicate who, in relative terms, has a greater strength level.