This is a bit of a weird one. 2-3 months you'd have had to tie me down to stop me riding a bike. Now I'm struggling to get on one. I'm still commuting 5 days a week and I'm planning to go out on Sunday for 100 miler with RB58,ianrauk et al. For some reason, 100 miles suddenly strikes me as a long way.
Also I was thinking of doing my training loop on Sat morning which is a 4 hour, 65 mile loop and frankly my mind is saying "Can't be a***d". Does this happen to others?
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Of course it does. Perfectly normal.
Sometimes the shortest of rides can be the best. I went down to my local shops this morning and back with cold wind and drizzle fighting back thoughts of "just get in the car". Once the legs were going i thought this is fab!
So plan for a short run and if you discover it's fun (which you will) keep on going.... .
You don't have to do 100 milers. You don't have to do x miles in y hours. Who is going to chastise you? Replace the word "training" with "fun".
It may be the constant commute that's getting you down? Doesn't sound like you give yourself a break from routine.