We'll have a variety of gym machines for supporters to have a go on, together with times set by the Saints squad for you to compare yourself against.
There will also be a supporters' leaderboard, too, with great prizes for whoever finishes top.
It costs just £1 per go, with all proceeds going to Sport Relief!
Rounds 18 and 19 of Aviva Premiership Rugby 2011/12 will see referees and match officials wearing Sport Relief patches on their shirts. Meanwhile TV broadcast partners Sky Sports and ESPN will be taking part in 'Cash For Cliches', which will see a donation be made every time a presenter, analyst or commentator use a sporting cliche during match coverage.
CLICK HERE to watch former Saint Ben Cohen's attempts at stand-up comedy in 'Stand Up For Sport Relief', currently available on the BBC iPlayer