Don't assume your old yoga mat will be up to the job when it comes to Joe's obsession with burpees, plank jacks, and mountain climbers. I shredded my first mat before I'd even finished cycle 1, and my second one started to shed about 10 days into cycle 3. Neither of them were dirt cheap, but neither were they as pricey as Joe's own HIIT mats (£45). Buying cheaper ones in the hopes they'll last may end up being a false economy so while I still think the branded one is overpriced, do your research and get a good one from the get go.