Anyone up for a ongoing fitness challenge?

I have always said I wanna pay this journey forward...specially with people on the journey and ultimately with people who have starting weights like i have. Anyway...ive been thinking i mite start some exercise challenges via my journal...anyone interested? Was thinking we just set a challenge each week exercise wise...like maybe one week its a 5km walk and we just post our times...or we post a post on our journals about it? Or we could do...30 minutes of 1 minute running and two minutes walking...or a certain number of pushups (say 50 pushups over the week so they could be broken up) or something similar...ill then leave a weekly post to report how i did (say on sunday nite) and id love to read everyone elses comments on how they did....any tips or tricks or struggles they had...we may learn from each other :) Anyone interested email me at princesskaryn@optusnet.com.au or leave a comment...i was thinking the first challenge could start the week of the 19th july....