Are low reps bad on cycle???

[saucerking]

That is a very real concern and I think you should be pro-active to avoid injury. That is not to say you cannot continue with what you are doing, but adding additional warm up sets and mobility exercises could help mitigate risk. Personally I would rather do an extra set, than squeeze out that last 110% huge rep.

I already do warm ups. And why do an extra set?

[SuperNova93]

I already do warm ups. And why do an extra set?

He already told you. To lower your risk of injury. The warmer your muscles are, and the better your mobility, the lower your chances are of injury. What he is saying, is by doing another warm up set, and adding in some Range of Motion techniques will help.