questions about a rowing machine

[deedee24]

i bought a rowing machine to keep fit, i get terrible headaches if i try to do sit ups or move to fast, so the doctor said a rowing machine would be better, i've used it twice but i dont feel like its doing anything, i dont feel out of breath after using it, dont have aches or pains, doesnt feel like i've workede out at all, am i doing something wrong? i have it on the highest resistance, thought maybe id feel it in my legs or tummy area but nope nothing,, please can someone help?

[mollykins]

How far and fast are you going, and roughly how long does this take?

[daffy654]

The resistance setting may not be high enough as it is a home machine. I know some exercise bikes that are for home use are absolutely useless for the same reason.
You may need to row faster to actually get out of breath.