Excellent advice all around, concerning both exercise and Vitamin D.
I have never had to deal with depression myself, but aerobic commuting has always helped me in my career, because by the time I arrive at the office by bicycle or on foot, I cannot be mad at anyone or anything. Likewise, on the return trip, aerobic commuting has always protected me from bring work-related stresses back home with me. Aerobic exercise is magic, but you guys already knew that.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069