How to train without a bike?

Tomorrow Dirk and I will be heading over to The Netherlands. My son Noah will be coming along on this 'Big Boys Trip' too, and he has already packed his things. He's been looking forward to this trip for months now, asking me almost daily when we are going. When you're 4 years old these things are pretty darned exciting! I will be staying at my parents' house for two weeks, putting together my showreel, meeting up with dear friends I have not seen for far too long, and doing some work too before the big storm of sponsorship sourcing, organising, writing, and so on will hit... It will also mean that my almost daily 30Mile (50km) rides will suddenly stop. Because in this country of cycles I actually do not have a bike in the garage anymore. The Dutch bike I had went to bicycle heaven many moons ago and the 1977 Peugeot PX10 I used to commute to school on has been in London now for almost 16 years. I will be bringing a bike with me though, but the rebuilt and rather tasty looking Cube Comp Custom standing next to me in the office here is actually destined for my brother. It's a late birthday present which is aimed at getting him to leave his car parked more often and taking the bike instead. And he actually asked for it too, which took me rather by surprise as he is a bit of a petrolhead. He very quickly forgot about his MTB when he was a kid, went to scooters and then to cars and has been trading up since. Well, at least the polished alloy and black colour scheme will suit his taste. It certainly always drew admiring glances when I rode it around London in its previous guises. But, it means no training for me for two weeks and I can already sense that I will be adding some more to my already highish weight. Sigh...oh well, I'll just call it energy reserves for the 22nd May, which is approaching all too rapidly!