Sitting meditation. Just relax and be aware. Do nothing.
Use stillness as an antidote for agitation. Use silence as an antidote to distraction. Observe the space where your thoughts arise, exist and dissolve as an antidote to the mind itself.
Many short sessions a day are better than a long session.
Another good and complete method is called anapanasati: pay attention to the movements of your breath, using it as an antidote to your distractions. If you catch yourself following a sensation, an emotion or a thought, recognize this and come back to noticing if the breath is going in or going out. Just that.
I also like some of the active meditations developed by Osho or social meditations developed by Veeresh.
Their base is in ancient yoga, where movements and breathing are united with mentalization to enter dhyána and samádhi.
However, if you don't have the basis for many hours of sitting meditation, they won't be efficient.
Look for methods of stretching your body a little so you may go through the sitting sessions without pain and physical issues.
Also, learn to integrate your meditation with all your activities of everyday life.