I posted awhile back about some of my workouts feeling too easy.
This last week, I have found a way around this, wth the Turbo Jam kickboxing-cum-dance workouts.
Each workout has one, two or four Turbos - short anaerobic drills, about two minutes long where you go all out and really get your heart rate up. Working out in intevals is a great calorie burner and also increases your aerobic endurance.
So, I've been upping the Turbos - today's Fatblaster workout usually consists of four low impact turbos and four high intensity turbos. I did four low to medium impact and eight high impact - LOVED it!
And I usually find, if I do only Turbo Jam for a week ( TurboKick is the gym version) - well, my upper abs get flatter and some little indents on the sides. I think its all the twisting and standing ab work.
Turbo Jam ( and TurboKick) always have low impact and beginner options so if you are after fun and better abs and good cardio that's my suggestion! lol!