Taking your shoes off and walking barefoot in the natural environment is called grounding or earthing. Some of the benefits of grounding include:
Many parks have free gym equipment that you can use. If you're not sure how to use the equipment you can find a tutorial on YouTube. Fresh Air Fitness has a helpful tutorial with a cute British accent.
It's spring - the weather is warming up and flowers are blooming. Go for a walk in your local park, bushland or neighbourhood and photograph the flowers you find. You don't need any fancy equipment - most smartphones have a decent camera. Here are some photos I snapped recently.