All the bad reviews for this app are accurate. I have e-mailed the developer twice and he advised that all problems will be fixed in the new version. But, he also said he was submitting the new version in November to Apple, which, I guess did not happen because when I wrote to him again in December he said he was submitting over Xmas for the first time. Do not buy this app until the new version comes out and you see good reviews on it. The developer also told me that the new version will not cost anything to upgrade if you have the old crap version that is currently available. So far I see no reason to trust him that will happen.
RockinClimber about Twenty Chinups