No, I don't have a 2nd device. I ordered from a different place than this. I wish I would have seen yours first. Yours is the only one I've seen anything about a second device on. I have been looking at this site everyday, as it has so much more information. I am doing it slow, holding for 3 secs & releasing for 3 secs. I have started on 2 springs because I didn't feel any resistance on one spring. But it seems like I have to use my abdominal muscles to see movement. Thanks for the FAST response! You are awesome. =)
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