I'd start wearing an HR monitor for workouts including weights, and religiously tracking this against your food intake. If the numbers don't tally with your weight loss or gain, I agree with another commenter that you should see your doctor. Might be something as simple as a hormonal imbalance that's affecting your metabolism, or it may be nothing at all, but once you know the root cause you can make a plan to achieve your goals. You're not alone in this - my uber-skinny husband, who naturally tends toward the body type of Machinist-era Christian Bale, actually recently joined SP with the goal of gaining 20 lbs!
My dream is that one day we'll weigh the same...
"I will run, until there's no one left to run. I will love, until there's no one else to love." - The Dears
| current weight: 222.0