I played soccer growing up for about 10 years. I played every position at least once including goalie, which I did for two seasons. I have played ice and roller hockey for over 5 years.
I have never had to play goalie, but I am a defenseman and am familiar with blocking shots and deflecting pucks with my body or stick, and protecting the "crease" and goal from opposing players. Since the puck is so small and shots come in so hard, I say it is more difficult, at least for a typical amateur, to play goalie in hockey. It also hurts a lot more, particularly if it hits you in a bad spot like, underneath your arm where there is insufficient padding.In hockey, goalies also see a lot more shots than in soccer so they are always busy and working hard, and therefore tend to sweat a lot.
If a soccer goalie stops ten or 15 shots in a game it is considered a lot. In hockey, 30 or 40 shots is not unusual. About the only thing that is "easier" in hockey is the positioning aspect, and that you don't have to be able to jump very high.
However, you do basically need to be able to do the splits, which soccer goalies can't claim! You also need cat-like reflexes to stop 90MPH shots and deflected pucks, and to be able to catch pucks like a catcher or first baseman in baseball.
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