You should break up the workouts into 2-3 day per week workouts concentrating on upper body twice a week with a day rest in between workouts and throw in the leg day between the upper body days. By the way, if you are limited to do your cardio and weights on the same day, I would suggest starting with the weights and doing your cardio later. I'm a 43 year old woman in excellent aerobic shape who got a low bone density test last week. For now I'm climbing the stairs at home 20 - 30 minutes at a time, at a pretty good clip, every day. I would suggest loading the spine as part of your upper body workout to help combat degeneration of the spinal column.
Squats are a great exercise which loads the entire body from neck to toe.
Start out working on your flexibility and technique without weights and eventually progress to a light bar across your shoulders. Each week gradually add weight to the bar. I would starting out with 12-15 repetitions. Once the weight becomes too easy, bump it up to provide a little more challenge. I'm a 43 year old woman in excellent aerobic shape who got a low bone density test last week.