Swimming may seem like a niche activity that only a few may seem inclined towards, but taken as a wholesome activity that pivots towards fitness, it is an extremely useful tool to help keep your fitness and your health levels high.

Swimming laps, doing exercises in water and strengthening oneself is a great way to stay in shape and in a place of good health. Here some of the fun ways to charge up your experience in the pool:
1. Swim a bunch of laps by yourself, but change the strokes every three laps. This will help your body use its muscles and tone your body evenly. Swimming different laps will also help you vary your workout suitably.
2. Try your hand at water aerobics! A fun activity, you don’t even need to know how to swim to do water aerobics. All you need is yourself and the right clothing, and follow your instructor. Everything from dance to full-fledged aerobics and kick-boxing can be done in the pool.

3. Cross train in the pool! It may be conventional to think that the idea of cross-fit centres around the land, where you’re carrying weights and roughing it out across a range of terrains. But, cross-fit can also be imported into the pool – and specific muscles can be targeted to achieve a great tone and impact.

4. Ab exercises: In the pool, working your core can be a fantastic way to achieve tone and weight loss. Water is about 70% more dense than air is, and this tends to provide a constant and consistent resistance. With that resistance, your whole body gets involved, and then creates a surge of energy and momentum. The core holds everything together and gets toned in the process, without having to do a single crunch or sit up.
5. Water yoga: Doing a few flex and movement postures – except those that require you to lie supine or bend over – such as the warrior pose or the tree pose, can be a good way to build your flexibility. Stretching in water gives your muscles a sense of flexibility and a sense of energy. This will further assist your body in attaining a state of suppleness when you get out of the water.

References:
http://www.womenshealthmag.com/fitness/swim-workout
https://experiencelife.com/article/swim-for-your-life/
http://www.dnaindia.com/health/report-world-heart-day-cardio-exercises-you-should-do-for-a-healthy-heart-2129736