what i like to do, is have a wide grip, bend my knees down... streighten out with my knees and then the final str8en with my back... that dosent give me problems... but when i go down... i seem to struggle, i dont know what it is, but i cant help it, but i bend my knees, then my back... instead of back then knees, that might be where im going wrong, but it seems like forced habbit.