Hi,
I recently had a long layoff from jumping, then did a AFF level 7 check out dive which went well. On my second jump using rental gear (235 main), i kept things simple just doing minor turns and practise pulls. However i had a really hard opening that felt like someone had punched me in the stomach as the main opened. Landing was uneventful, but i've ended up with a suspected bruised rib which is still hurting 4 days later!
One suggestion that seems likely is that i was moving forward during deployment. I know my inexperience and layoff time have not helped either.
Does anyone have an ideas on what causes sharp openings and ways of stopping them happening again in the future??