The reverse plank exercise isolates and strengthens the gluteus (butt) muscles and hamstrings. Done correctly, it engages both the abs and the lower back muscles. The reverse plank exercise can also be used as a rehab exercise to improve core and spinal stabilization.
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Other video sources. If you didn't buy your videos from the iTunes Store, they might not be in a format that you can play on your iPhone, iPad, or iPod. In many cases, you can convert them to the correct format using iTunes. Your File ] was not copied to the [ Device Name ] because it cannot be played on this iPhone.. iTunes can play a wide variety of video formats, but iPhones, iPads, and video-capable iPods play videos in specific formats. To learn which video formats your device supports: 1  Visit the Apple technical specification page.