2 hours before my body is comfortable

For the last few months i have been having foot/calf cramps.
I notice that when I go out on long rides, the first couple of hours are uncomfortable i.e. i get foot/calf cramps when i put the power down, attack a long hill, and i find it hard to get comfortable in the saddle.
After about 2 hours, everything seems to get much more comfortable. I dont shift around in the saddle to get comfortable and i can put the power down without really getting and calf/foot problems.
Anyone have any ideas?
I notice that when I go out on long rides, the first couple of hours are uncomfortable i.e. i get foot/calf cramps when i put the power down, attack a long hill, and i find it hard to get comfortable in the saddle.
After about 2 hours, everything seems to get much more comfortable. I dont shift around in the saddle to get comfortable and i can put the power down without really getting and calf/foot problems.
Anyone have any ideas?
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(i.e. within the hour) for the first ten miles/hour or so I feel sluggish, mainly because my body is using a fair per centage of energy digesting my brekkie which leaves less to go to my legs.
I suppose an extreme version of this would be cramps in your calves?
XC/RR'ing + Training Blog
I just eat small amounts and drink plenty on the ride and I feel brand new!
Although went for a run today (minus bike) and now feel like my legs may fall off!