On the subject of Fitness balls, I believe that quality much outweighs price. Ball Dynamics is one suggestion (a place to start) for high quality, low burst rate Fitness balls. I think their balls hold up to 600 pounds. Also try about.com/Fitnessballs for some good info before you decide.
You can buy bosu balls online at the Bosu Ball Company website, www.bosu.com. You can also buy them on Amazon.com second-hand. You can also go into a fitness store near your address and find them.
it makes my balls sweaty
The following website has many videos on using exercise balls: http://www.fitnessmagazine.com/videos/exercises/exercise-ball.htm These videos are instructional and provide great how-to information for beginners and fitness enthusiasts alike!
The website Witness the Fitness offers visitors fitness video and fitness services. It allows one to see training schedules and routines and take fitness classes.
http://www.everydayhealth.com/fitness/measuring-personal-fitness-level.aspx is a good website too look at to see how to measure your fitness level. There's information and tips on the website.
Exercise equipment that would help you with core fitness are stability balls, kettlebells, ab wheels, medicine balls, chin up bars and rowing machines.
There are many different prices for Fitness balls online. You would have to go online to see which ones and how much they cost. The price can range from anywhere between $10.00 and up.
You will be able to find new parts for your life Fitness machine on life Fitness' own website http://www.lifeFitness.com/pressreleases/lifeFitnesscorporate/life-Fitness-launches-new-parts-website-to-support-orders.html.
The Fitness Works website contains Fitness information for a variety of individuals, from kids, to seniors. It gives tips for working out, and also provides information about their personal training programs.
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Fitness 1st is a popular company with their own website and additional information is listed on their website. Here is the link: http://www.Fitness1st.com/