Yeah, I'd get crazy high readings. Like over 200 and then it'd often times even say "heart rate too high." I haven't had that once since I started using the gel and changed to the other type of heart rate strap. Unfortunately I did both at the same time so I can't identify for sure which one solved my problem. But I went to the gel by doing a lot of searching on the internet and read cases of people having the same problem and the gel ended up being their solution so I decided to try it as well.