Developing your surfing so that you can get out the back, beyond the broken waves, is a natural progression for your surfing. These Surf Insight coaching videos describe the correct paddling out technique for different board sizes.
Paddling technique for mid range boards:
Paddling technique for short boards:
It is often a struggle with the bigger boards but do try to stay with a board that allows you to catch those waves when you do actually get out the back. Don’t choose a board that just allows you to paddle out and duck dive easily. It’s a common problem and good technique will beat the need for strength every time