I've started back to work today , I work on a rota basis , 7 days on 7 off , I ran to work this morning , but it's a bout 2,5 k there & 2.5 back , going it takes me about 18 min ( did this morning , its a bit hilly in places) , 15 min back . Is it ok to just do these short runs there & back 3 times a week , or do I need to get a couple of longer ones in ? Scared I'll lose some fitness & will only want to do short runs when it's my week off . Thanks for any advice . I work 10 hrs a day for my wk at work , so it's hard fitting long runs in . Just on my way back now ( in car ) .