Omega-3 is an essential fatty acid that your body can’t make itself, so you have to get from your diet. It’s found naturally in fish oil — so it can be difficult to get enough of it from what you eat alone.
 
Omega-3 contains EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) which both play an important role in supporting heart health — meaning these will support your fitness goals, alongside your general wellbeing.