Former Home and Away star Dan Ewing wrote, Rigs of SAS calendar has started .
Ripped: Uploading a mirror selfie to his Instagram, the 44-year-old wrote: SAS aftermath - never been so excited to watch my ass get kicked, alongside a flexed bicep emoji
Sam Burgess who will also appear on the upcoming series wrote: Absolute machine .
Meanwhile, SAS chief instructor Ollie Otterton wrote: SAS - Super Ab Solutions! Hope the experience was worth the pain..what an adventure for both body and mind, one user commented, to which he replied: 100% .
The post was quickly inundated with comments from his fellow co-stars including Sam Burgess (pictured), who wrote: Absolute machine