Agreed with everyone in here stating to drop Insanity...it's not necessary. If you are rapidly losing weight and it's after the initial phase where you drop a few lbs of water in the first week or so, your calories are not high enough to support your current lifestyle. The manual labor type work serves as cardio, the only thing adding more cardio do would be allowing to take in more calories and hence reducing your deficit, which you seem to be in (hence, rendering the extra cardio useless). If you are only tracking your protein, there is no way of telling what your exact caloric intake is, and you will be relying solely on the scale/mirror. This will most likely cause you to be running on 1500 cals or so when you begin to stall, feeling like shit, lethargic, messed up metabolism, etc. when you can be eating 1000-1500 more with your job and continuing to lose weight.
If you are truly interested in your daily expenditure and don't want to take our word on it, you can invest in one of these. It will certainly give you some insight on just how many calories are being burnt in your manual labor. It will set you back a couple hundred (I think) but just look at some of the people running it and the IIFYM approach they are taking and how well they are doing with it.
Bodybugg - everythingwentbetterthanexpected.jpg - Bodybuilding.com Forums