Considering 150 lbs looks different on every person... hehe If you have V3, she also has body morphs to change her 'weight'. Some of the 'Heavy' morphs aren't particularly realistic, but you can use some of the full body morphs with negative values or in combination to get the affect you want. The only real problem is if you do, conforming clothes are a misery to fit. Hooray for dynamic cloth. -.-