I only have about 15 mins for exercise in the morning, I struggle to get into doing anything strenuous, does anyone have any suggestions on how to get into exercise quickly and make the most of my short amount of time?

Try searching for a short workout youtube video and use it for your daily exercise routine (example: 3 minute dance workout for beginners)

Get up. Clean up. Put workout clothes on. Put hair up. Fill water bottle. Have Beachbody or Thrive Energize. Use any Beachbody on Demand workout or ZUMBA or Body FX. Bang it out. Push play. Done! Get in the shower and you are new and improved by the day.

A quick run is the way to go, or start small, with just a walk, even if it is just 5 minutes, and keep doing it until it becomes a habit, and if you do not do it, you don't feel complete. After it becomes a habit, try 10 minutes and so on.
Or, if you have more time on the evening, go for a small run, or walk, and move on up, 10 minutes to 15 minutes, jogging instead of walking and so on.

This question made me think! If it were me, any amount of excercise would be great. I would split up muscle groups and focus on one a day. For example, Monday legs, Tuesday core, Wednesday cardio etc. I hope this makes sense.

I like dancing to upbeat songs. There are some good youtube videos to help but sometimes i just do something as simple like one of those songs with a specific dance like the cha cha slide