I've been taking a weights class twice a week for a year or so now. I love it and it has helped me get strong and fit. Along with eating primal I have lost weight and inches and feel great.

Now I have the opportunity to learn to lift heavy (whatever that means, I only have the vaguest idea).

It kind of intrigues me but on the other hand I am not into extremes and do not want to risk injuring myself when I'm feeling the best ever.

So, just wondering, what would be the point in me upping the ante here? Pros and cons? Other suggestions for new goals.

My details: Age 48, Gender F, height 5'4", weight 59kg.