So after quite a bit of research, I created this training regime. I've used everything from the royal marines fitness poster and then added in some extra stuff in order to help me gain weight: Monday: AM: Arms weights+Running - Tempo - 30 min | PM: Circuits (as designated on the poster) Tuesday: AM: Core weights+bodyweight+ Swimming 30 min | PM: Circuits (*text deleted* try and find another type to change things up) Wednesday: AM: Shoulder weights PM: Running - intervals Thursday: AM: Leg weights | PM: Circuit Friday:AM: Arms weights + Swimming - 30min | PM: Circuit Saturday: AM: Running - steady - 60 mins | PM: Chest weights Sunday: AM: Rest The runs I do are along the Mendip hills (if you're in the area send a msg would be great to have a workout partner). I have added weights into there, not because I want to become huge (I've heard that can be very detrimental to the running side of things) but because I really need to gain weight. To help with this I am trying to eat approx 500 calories extra than I normally would. There is a technique behind it that you all may have heard of before: Add that no. calories to your normal diet until you stop gaining weight for 2 weeks, then add another 500cals That's about it hopefully, it doesn't look too retarded but I am open to every bit of advice possible - I need it, Thanks.