Also there are some ics that can do this like the lm3916 which can give you 10leds as a bar graph plotted accross whichever range you select, in bar or dot mode and has current limiting so 1 set resistor will do all 10 leds
there are in that same ic family linear and logarithmic ranges for uses in audio,
all you would need is one ic per muscle group and you will get nice led graphs that don't need any programming although then you can do signal conditioning in software