I started increasing my weight training recently to build up my strength and tone my muscles.
Oh, nice! Did you start lifting heavier weights, or did you come up with a new routine?
I have been progressively increasing the weight and then I do also alternate the variety of exercises I use to keep my muscles guessing. It really gives me good results. I just went up by 5 more pounds.
Very cool! How often do you increase the weight?
About every 2 weeks as long as I'm handling it well.  I also use body weight exercises on alternate days to help with flexibility, endurance, speed, and power.