Dust off the bike

I’ve set myself a challenge to run/ walk/ cycle or swim 1000km in 100 days to raise money for some friends. Today I worked from home and sat down all day - I then had to go and stay at the hospital on call so no way I would be getting 10km of walking in today. Decided to jump on the exercise bike I bought about a year ago and haven’t used once!! I rattled out 10km on it but it was hard going! Starting to panic about this triathlon we are doing in 6 weeks time!! Eeek!