My bike route today

Today I have gone went biking (or "biked") with my mountain bike to the Calderona Mountain. ( I don't know how can i say Sierra Calderona....the word Sierra English ¿?). I waked woke up in the morning about half past seven. My wife and me I dressed, maked made a cereal bar and started pedaling. It is very hard to bike up a hill, but we have achieved our goal. We are biking around one and half hours. My wife is really ready (fit) because she practises several sports...swimming, running and biking. it is difficult for me to keep pace with her. After some mountain passes we have arrived home. It has been a fantastic morning of sport. We sweated a bit, but we are very happy......;)))

"today I went biking in the Calderona mountains." or "Today I went to the Calderona mountains to bike" both are OK. no necesitas "with  my mountain bike" cuando usas el verbo "to bike" 

"My wife is really fit because she practises several sports...swimming, running, and biking" - tu esposa es una atletica

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"My wife is really good because she practises several sports...swimmiing, running, and biking" - tu esposa monta en bicileta muy bien porque ella correa, nada...

sorry if my spanish correction are unclear. basically, the word "ready" means "prepared to", but in the sentence here it's difficult to know what you mean. Is your wife in shape, so the ride was easy; or is the ride easy for her because she practices a lot of sports.