"Women are particularly likely to stick with a light weight routine because they're afraid strength training will cause them to 'bulk up,' with bulging pecs, thunder thighs and a big butt. Truth is, most women simply do not have the biological means — high levels of the hormone testosterone — to look like a bodybuilder."
"In a recent study published in the Journal of Strength and Conditioning Research, [it was] found that everyone in a small group of novice weightlifters failed to use enough resistance to do them much good."
So for heaven's sake, put those tiny dumbbells down! If you're taking conditioning classes and using weights that are not challenging you, you're wasting time!!