hi, im looking for some advice. im trying to tone up so want to introduce weights into my exercise regime. i do bicep curls, french press and squats with dumbbells - what kind of weights should i be lifting? at the moment i do 6kg bicep curls, 8kg french press and 10kg dumbbells with squats. i feel like it's not working though because my muscles never ache the next day or anything - do i need to increase the weights? im only 5ft4 and a size 8 so im pretty petite