An open training session and a surprise hill sprint challenge were on the agenda for day four of Richmond's pre-season camp on the Sunshine Coast.

The Tiger Army was out in full force at Maroochydore Multisports Complex on Thursday morning to catch a glimpse of the Tigers during their week-long camp.

Players were put through a tough training session, before meeting fans and signing autographs.

Richmond fan Finley Coll (pictured below) was among the strong Queensland crowd.

A mystery activity followed, which resulted in a surprise hill sprint challenge in the soaring Sunshine Coast heat.

The playing group then got some respite at the beach, with a recovery session. 

Scroll down for all the photos from Thursday morning.