Like others have said, perhaps biking isn't your thing. For me, I like to keep my workouts short and intense (<20min) and make sure I get the most out of them.
Here are some things that I do:
* High Intensity Interval Training. Basically I sprint for 10-20secs, walk for 30sec-1min, 8 times.
* Density Training. Set a timer for 15min, do 3 pushups, rest 10secs, repeat until time runs out (once you cant do 3 pushups extend rest period to 20secs)
Best part of each of these is they require no equipment, can do them anywhere, anytime and you really only have to do them once or twice a week.
Here are some things that I do:
* High Intensity Interval Training. Basically I sprint for 10-20secs, walk for 30sec-1min, 8 times.
* Density Training. Set a timer for 15min, do 3 pushups, rest 10secs, repeat until time runs out (once you cant do 3 pushups extend rest period to 20secs)
Best part of each of these is they require no equipment, can do them anywhere, anytime and you really only have to do them once or twice a week.