Strength training advice

I say don't use machines. They do make it a bit brainless an endeavor. Grab some dumbbells and either use a balance ball to sit on or sit on the bench. Stick to some very basic upper boddy stuff (bicep curls, tricep extensions, bench press, shoulder presses, etc.), do about four sets of each, and you're going to help your metabolism a whole lot since you'll be building more lean muscle. You're not necessarily going to bulk up. That's always my wife's biggest fear, but every expert she's ever talked to has her going back to weights.

Of course, stick with the rest of what you're doing.

Good luck!