>>76497195
Direct ab work wont help. You need to work on breathing and bracing properly for OHP.
>big breath when unracking, this has a huge effect on how strong you feel at the start of the set
>squeeze your legs and glutes to brace your body
>work on your shoulder flexibility, bar must be over your core and midfoot
>work on your standing rack position, bar must be on your front delts with your elbows slightly in front of your wrists
>press in an almost straight line upward, you could be pushing diagonally and leaking power and stability
What I did at a point in time was to practice stability drills. As your very last ohp set in a workout, take about 70-80% of your 1RM and do a single rep, holding it at full lockout for a 10-15 count, you will be shaking like a leaf but it will work