While iTunes for Windows allows you to connect multiple iPod devices simultaneously to the same computer for charging, you cannot sync your data from the computer to all the iPod devices at the same time.
From http://rss.support.apple.com/ipod
You can use your iPod nano (6th generation) button controls to pause and resume your workout, change songs, hear spoken feedback, or switch to a PowerSong for extra motivation. If you use Apple headphones with a remote, you can control your workout with the remote.
From http://rss.support.apple.com/ipod
You may be unable to set the time zone on your iPhone or iPod touch.
From http://rss.support.apple.com/iphone
