Im 51, 5ft 8" and weigh 9 stone, my BMI is 19.3 so I don't think i'm overweight but I feel and look flabby when naked, I look fine when trussed up in clothes! ! over the last 2-3 years I have slowly lost muscle mass which I know is a thing with age but what exercise should I do to tone my legs, bum, tum and arms? I have a job where i'm fairly active and I walk my dog daily but very little other formal exercise. Can anyone suggest any online sessions I could follow that work for a beginner. I feel if I just try to lose weight I will look gaunt and scraggy at the top half whilst everything seems to be travelling south!