This workout is great for a quick workout that targets most of your major muscle groups. Also, these movements are fairly low-impact.
For this workout, choose the timing you want to do for the exercises:
Easier - 30 seconds work, 30 seconds rest
Medium - 40 seconds work, 20 seconds rest
Hard - 50 seconds work, 10 seconds rest
Repeat this entire set 3x.
Just like the name suggests, do a reverse lunge, then do a forward lunge on the same leg. Repeat on other side.
Lie face down. Raise your head up a few inches off the ground and look a little forward. Make a 'W' with your arms and raise them up and lower them back down. Repeat.