I am 67 years old and have been active all my life including using Cathe's tapes for the last 20 years. I am very small-boned, 103 pounds 5'3". This year I am finding that both strength and endurance are on the decline though I hate to admit this. Have been doing STS series faithfully for the last year and a half. Recently purchased the LIC and can do all except the Afterburn which requires I take a break quite frequently. This is also true of all the Advanced step cardio routines even though I use a 4" step. My question is should I fight this (which I've been doing for the last year) or ask that you develop an over 60 series that is more intermediate re the cardio. With the STS I was able to increase strength in the chest, back and legs but NOT the biceps or shoulders. In fact, injured shoulder 3 months ago and it's still on the mend. Can do about 1 dozen pushups on toes which I think is good for my age but I have no way of gauging this. Anybody out there my age with similar issues? Would love to hear from you...and Cathe, please remember there are some really older fans out there who love a good workout but aren't up to the challenge of 100 jumping jacks!