I have been strength training for about 3 1/2 months now. I have to say, I love it! I definitely feel stronger and can see the difference in my muscle tone since I began all of this. lately I have been so thankful for the 100 squats that I do in my 24 SET classes and Lift classes, as they are really helping me out with my running game. Granted, I am not a strong runner and with my bad knees, I am not gearing up to take first place in my 5K, by any means, but when I hit 20 minutes of what feels like endless strides across town, I am not nearly as sore afterwards and I think I owe this to my complimentary gym workouts.
If you are debating adding weights into your routine, I strongly recommend it. If you can't afford the gym, make a game out of it with the kids. You will find that they will wear you out and you will get a workout and quality family time in too...It is a win win for everyone!