I know exactly what you mean! If I don't run, row, or do some core ex each day I start to feel 'itchy' and slovenly. Truth is though, if I ran as frequently as you, and with those distances, I'd feel sorted for months ahead
Dumbbell bicep curls. 2 X 12.5 kg. Simultaneous lifting with both arms. 2 mins break between sets, during which I did (x10) reps of floor to lock to floor press-ups. Curl Reps were to failure, per set.
24 (10) - 17 (10) - 14 (10) - 10 (10) - 11 (10) - 10 (10) - 10 (10) - 9 (10)