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To quote psychologist and philosopher William James:"It is our attitude at the beginning of a difficult taks which, more than anything else, will affect its successful outcome." I couldn't agree more. I hit the floor running - and smiling.

Could you tell me what does the last sentence mean? In particular, what does it mean by hit the floor running? Thanks a lot.
Comments 
Hit the floor running = begin at maximum speed or effort
smiling = happy
Hi Mister, but I do not find it make sense in the context. So, he agree with the qote, then begin at maximum speed or effort? Could you be more specific about this? Thanks.
It seems quite obvious to me: he hits the floor running (= begins at maximum speed or effort) at the'beginning of a difficult task'.