Diving specific core work.
Here is a great ab workout if you are too sick to get in or if you have an injury preventing pool.
Rock and Rolls – 25 each way – Hollow Rock, 1 knee up, Other knee up, Straddle
25 x 5 count Tuck Kick Outs
10 x 4 count Pike Voluntary Kick Outs
10 x 4 count Pike Optional Kick Out
Age in Push Ups (Toes Pointed) –> 1:00 in #3 Hollow Hold –> 1:00 Toes Pointed Plank on Elbows
Plank :30sec –> Side Plank :30 –> Back Plank :30 –> Side Plank
:30Bicycles – both legs = 1 x 50
Twisting Death Roll w Over the Top Square Out – 10 Each Side
