I like compound exercises that use several muscles/joint combinations. They tend to be more time efficient & burn more calories.
My favorite is called a Bulgarian Split Squat. OK....I saw your eyes glaze over! Check it out here: http://www.youtube.com/watch?v=q_Q8FKO7Ueg
You will probably want to chuck to dumbbells and make sure you have something to grab for balance. It's great for your glutes & hamstrings.
Front squats work your quads more than regular squats. They also work your core. You can use a couple of dumbbells held on the front part of your shoulders if you do not/cannot handle a barbell.
http://www.youtube.com/watch?v=yHu4j...eature=related
For functional strength that you'll use on the bike, I tend to stay away from most leg exercises on machines, e.g., leg extensions, hamstring curls, etc. Because your weight is supported and motion is predetermined, it doesn't carry over to functional strength. Think about the times you've had to squat in your kitchen to get a pan. Now, think of the times you've had to do a hamstring curl.![]()