I am riding my stationary bike for 45-50 minutes per day, or atleast that is my goal. I have to wait until my baby is napping and have to get off when he wakes up because he likes to play with the pedals. Is it worth it to say get on my bike for fifteen minutes 3 times per day equalling 45 min? There are some days my son doesn't nap at all, and even though I try to get on it , I can't listen to him scream for 45-50 minutes in his play pen (all at once).
Second question is how long should I be aiming for strenght training I have a weight machine that is primarily for arms (but a few for the legs). Is it better to aim for number of sets or minutes doing it.. I generally do 3 sets of 15 reps for each different exercise.