I'm wondering if anyone trains twice per day? At present I run or swim or do a gym session (strength training) for 1 hour 6 days pw, and have been doing this for a couple of years. I'm loving the running, though, and it is edging other stuff out, which I realise is not nec so good for my body given that running is high impact (I've a longterm back issue, have great phyisio and go-ahead to run, but have to keep up yoga and pilates and strength training to avoid injury). So, I'm wondering about having a low-impact second session on my 4-5 running days - yoga, strength work or a swim. I don't have any real goals other than keeping fit and healthy - don't want to lose weight, am not into competing, so this is just for enjoyment and seeing my fitness improve overall. Has anyone else tried this, and if so, is it productive, are there things (e.g. need for diet tweaks, injury risks) to watch out for? Thanks.