Just do crunches.
Neither just do situpsReferences :
As far as I know, the Ab Coaster is more effective but it costs $400 and takes up a lot of room.
Check out these 2 reviews to see which machine is better:
http://burnmybellyfat.com/ab-coaster-review.html
http://burnmybellyfat.com/ab-circle-pro-review.htmlReferences :
Just do crunches.References :
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Neither just do situps
References :
As far as I know, the Ab Coaster is more effective but it costs $400 and takes up a lot of room.
Check out these 2 reviews to see which machine is better:
http://burnmybellyfat.com/ab-coaster-review.html
http://burnmybellyfat.com/ab-circle-pro-review.html
References :
Just do crunches.
References :