I received my Stealth Professional on May 7th. I typically do a single plank and then some floor exercises for abs. My planks were only about a minute to a minute and a half. When I first used the Stealth I was only able to do about 3 minutes total between two different games. It challenged my coordination. I liked Galaxy Adventure and Bubble Blast best. I was feeling it a lot in my arms and shoulders, so I took a video of me on the Stealth and posted it to the Facebook page for tips and or recommendations on my form. Everyone was so encouraging and helpful.
I had surgery on my big toe on May 28th so doing planks on my toes was out of the question. Two weeks after, I started back, but on my knees. I doubted I would really feel anything doing this on my knees, but I was wrong. It did take a little longer to feel my abs engage, but they definitely were being worked. I also felt this in my glutes and thighs. Thanks to the recommendations I received I started to engage these areas as well. At that time I was doing about 5-6 minutes on my knees, again playing Galaxy Adventure and Bubble Blast. I try to use the Stealth every day; the most I'll skip is only one day. 11 weeks from day one, I added Racquetball into the mix and I did 26 minutes between the 3 games. When I start I look at my best time and score and say "Oh I won't be doing that much today.” but lately I've been beating that score and time, even if it's only by a few points and a few seconds. While doing floor exercises are good, there's no incentive to do more than your usual sets. With the Stealth it makes you want to beat your best score/time.
I couldn't be happier with the Stealth; it has strengthened my core tremendously!