Welcome, Lauren! 40's are great - all those little bits of experiences and knowledge start to come together into a cohesive view of the "big picture".
It's a great time - the body still responds to positive changes in diet and exercise, and we can be just as strong and fit as we want to get (my idol is Dara Torres!). No matter where you are in your journey, there's chicks here that are in the same spot - we are truly greater than the sum of our parts!!