nice words for a male friend doing a marathon

[blingblingbling]

Hi. Dont know if this is the right place for this thread. But anyway, my close friend (first boyfriend all those years ago) is entering a marathon. He is wearing a white tshirt and is getting everyone who supports him to sign it and write a message. I live very far away from him. He has asked me to get a cheap tshirt and sign it and send it to him. Im rubish at this kind of thing. Can anyone help me out. TIA

"Very best of luck, you'll do well!" ?

I'm not sure you need to put more than that do you?

"If you can read this he's not running fast enough"

'Run Forrest!'