will commuting be more or less help to my fitness?

i have started this week to commute to work, it is only a 3 mile route pretty much downhill on way to work and uphill on way back. i tend to have 2 proper ride in the week say tuesday /thursday then long ride saturday.usually that would add up to near 90 milesish. i guess i will only know in time if its a bad thing for my training as in theory i don't get much of a rest...forgot to mention i work nights so this week i have not had a rest day since friday. i have already thought i shoulnt ride after my long ride on saturday till monday night to recover.
enigma esprit
cannondale caad8 tiagra 2012
cannondale caad8 tiagra 2012
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3 miles isn't anything. Spinning your legs out should not do any harm, just don't put any effort in.
I'd probably want to warm up for, oh I dunno about 3 miles, before riding as hard as I could
Yes it will be damaging if you go all out for that 3 miles because you wont have warmed up, just cycle but pootle along and put in zero effort.
And 3 miles is not a warm up...takes me 45 minutes to warm up!
cannondale caad8 tiagra 2012