Jonathan Davies, Rowland Phillips and Nigel Owens and Alex Jones are enjoying the Six Nations Championship during a seven-part series.
In the programme, Jonathan, Rowland and Nigel go head-to-head in a series of physical challenges to see who is the fittest.
There are weekly video updates of behind the scene footage on Facebook. Join the Jonathan group to see the extra material.
The series also features chats with special studio guests and they also take part in 'Ar y Pyst', the popular rugby conversion challenge.
5 Mawrth at 21:00
The guests will be sports commentator Ian Gwyn Hughes and actress Sue Roderick.
12 Mawrth at 21:30
Joining the team on the sofa will be Sarra Elgan and Clive Rowlands.
19 Mawrth at 22:00
Football commentator Malcolm Allen and actor Rhys Parry Jones are in the studio.
© 2010 S4C
O Gymru / Made in Wales