Thanks for the post on my blog. The weighted ball thing came with it's own DVD of exercises. It's used for alot of abdominal exercises and just makes it harder since you're using an 8 lb weight. You can also use it for some shoulder exercises.
wanted to say congrats on re-committing to having your healthy lifestyle envelop your time off. also cool about getting a treadmill, my partner and i got one about a month ago and it has really helped me have consistency in my workouts.