If you want to get the maximum benefit from running, try strength training twice a week.
Start with light weights. Don't over do it. Weights can be purchased at a reasonable price.I picked these up a a yard sale. No need
to buy expensive machines. Better still, try your local YMCA. They will have everything you need to get started. Furthermore, they will have someone there to assist you in reaching your goals. Read articles on weight training before you start. The library is a great source for material. After you've started , incorporate strength training in your weekly routine. Remember, lifting weights burn calories and tone muscles.