Two Scarborough RNLI crew members, Kyle Patel and Richard Egan, have entered the London Marathon on 24 April.
They are hoping to raise at least £2,300 for the lifeboat.
Kyle said: “Anyone who knows me will realise what a big achievement this will be for me. After all it was only three years ago when I weighed 20 stone and smoked 40 cigs a day. To sponsor Kyle, go to www.justgiving.com/kylepatel or send a text to 70070 with the message KPAT99 followed by an amount. To sponsor Richard, go to www.justgiving.com/Richard-Egan.