Simple routines you can work into your day!

Easy Routines:
while watching TV, work the pyramid routine. Pyramid up and down in a certain time frame with 1 or more exercises.
For example, while watching TV, every 10 minutes move to the floor and do ten 2 part crunches, and 10 leg lifts. Then at the 20 minute mark, do 20 of each. At the 30 minute mark do 30 of each. At the 40 minute mark start your pyramid back down and do 20 of each. At the 50 minute mark do 10 of each. You can extend the time and or number of reps or exercises to make this easier or more challenging.

Medium Routines:
Use your pyramid timing, but shorten the interval, start with 10 reps of the exercise, or each exercise, then every 5 minutes, add 5 reps. When you hit 30 minutes you will be doing 35 reps. Then at 35 minutes 30 reps, 40 minutes, 25 reps, 45 minutes 20 reps, 50 minutes 15 reps, 55 minutes 10 reps.

Tough Routines:
A full core routine, repeated every 15 minutes for an hour. Or every 10 minutes for an hour. Or every 5 minutes for 30 minutes.
Lower Ab routine:
Reverse crunch - starting on your back, legs straight up, press your legs up as high as you can
Deadbug
Scissor kick
Cross body mountain climbers - push up position, knee up to opposite armpit
Downward dog position to single leg up - alternate

Oblique and Ab routine:
Side plank
bicycle crunch
side V up
cross body mountain climbers
russian twist

Core routine:
Front plank
Front plank to push up
Mountain climber
Down dog to plank
Side plank to knee up