my 2 cents is any exercise is better than none! I can't attest to the quality of your purchase (or not) I ride a 30 yr old road bike (40 miles 2x a week at 17 mph thank you) and and cheap mt bike (pace unknown- but come home wasted) I think folks get too hung up on brand/make ect..... it is the engine and get your butt off the couch (: (please excuse the %%^%$3 but I just got eye rolled at the local trails by Mr. duel suspension rich dude)