I'm contemplating a charity walk in June. I think I'd struggle to fit in a proper training programme (I'm a SAHM with my youngest who is 14 months). I'm 46 in May, I'm fairly fit. I do a Jillian Michaels or Bob Harper DVD most days, I currently walk 4.5 miles with the pushchair once a week, plus another walk of about 3 miles with the pushchair once a week. And we regularly go on family walks of between 5-8 miles. But I think I might be being naive about this and underestimating how hard it will be. Any advice?? Thanks.