Currently I use resistance bands for my workout using exercises off of the USTA website. I do the strength training every other day. Then on the days I am not doing strength training, I do 400 crunches (alt., dbl., rev.) and then 50 back crunches. Every day I do 25 mins of cardio, either the treadmill @ 8.5 mph for 25 mins or the bike at 20 mph for 25 mins. I have been doing cardio every single day for the past year and a half, but I just started with the strength training. Do you think that my workout is lacking in the area of strength training since I only use resistance bands and no dumbells. Also do you see any problems with my workout? Tips are greatly appreciated.