Can't make keiko.....?
No worries, just remember to at least do something, anything even if it's not jishu (your own keiko) get out and run, do pushups, swim, squat. Hell, I have friends who even climb trees for exercise!! 30 to 45 mins of hard, explosive work will suffice in maintaining fitness, emotional and spiritual levels and reduce feelings of 'having missed out'; well for the most part anyway! Just get out there and do something people!!