Usually, when I find myself riding one day and skiing cross-country the next, or even doing both in the same day, it happens at the end of ski season.  This winter, though, I get to compare the activities side by side when neither is at its best.
A cyclist and a skier both flow through the landscape.  When I have to choose an alternative to skiing I always hope I can ride.  Running or hiking won't provide the same rhythm and glide.
Cycling and skiing each have their own rhythm.  A skier works much harder on a climb, and steers more dynamically on a descent.  Racers now talk in skiing terms when descending at speed, but rubber on a road does not act quite the same as a ski edge on snow.  Cyclists can easily reach alpine ski speeds going down a hill, while Nordic skiers will get big thrills at lower speeds, on their light, fragile gear.
Using a fixed gear I keep the speed within a narrower range than I would if I used a bike that could coast at the full speed gravity would allow, or let me use bigger gears at will to sprint or draft trucks.
After skiing I feel warm for hours.  Nordic skiing uses upper and lower body muscles, whereas cycling uses mostly the legs.  I feel nicely cleansed after a good bike ride, but completely renewed from skiing.
Taking the fixed gear into the hills I can add some upper body effort to the workout, but it is hardly as complete as if I had been hammering on a set of ski poles for a couple of hours.
Because I am not getting to ski day after day, I have not developed all the upper body weight and strength I normally do.  It's like starting the season over and over as conditions deteriorate and then return with each trivial snowfall.  Alternating with brief periods of skiing I can snatch a few rides.  These don't really build my cycling form, either.  It's all way better than nothing, but it's just treading water.  If I had serious athletic objectives it would really bug me.  Instead I am just glad I can get out and do something.
 
 
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