In addition to relieving aches and pains, these are 3 balls that I love training with. You can make it as easy and pain free as you like, or as intense as you like. The possibilities are endless of what you can do with these. But I'll go into more detail in future posts.
1: Bosu Ball - My current favorite "toy". Stands for "BOth Sides Up" or the more PC term, "BOth Sides Utilized". Great for building core strength, balance and overall body strength. Anything you can do standing or sitting on the ground you can do standing on a BOSU (crunches, twists, push ups)
A nice trick just stand on the BOSU while you watch tv to tone your abs and legs.
2: Balance / Yoga Ball Pretty common, so I wont go into much detail. But another trick sit on this, and try to balance with one leg while you watch tv.Your abs wont know what hit them.
3: Medicine Balls. I like to toss these up in the air and catch them. Its great for toning your arms and back muscles. Toss them up, to the side, against a wall or to a partner. Hold them while you do lunges or Russian Twists/Crunches. Add these moves on the BOSU for a more intense workout.