1. Risk of Injury
Alright so let's start with how our egos can cause injury in the gym. This is pretty simple people: Do not try to lift more weight than your body is capable of! If you want to increase your strength you can definitely do this, but it is a slow progress. Trying to lift more weight to impress your workout buddy or that hot girl by the smith machine, or because you want to reach that PR even though you're not ready, will only increase your risk of hurting yourself. This will obviously set you back even further. Instead, trust the process and start with a weight you are comfortable with. Each session try increasing your weight by 2.5 pounds. There will come a time where you will be stuck and can't seem to increase your weights. From here, change your program by adjusting your exercises and workout volume. If you are training for strength try sets of 6-8 reps.
2. It's not helping your gains
This brings us to our next point - lack of muscle activation. If you are letting your ego rule you at the gym there's a good chance you are lifting too heavy or speeding through your workouts. Of course, we can all curl 10 pounds heavier when we throw our back into (see risk of injury above) and the rep only lasts 1 second. Instead, take a step back, lower your weight and slow down the exercise. Try a tempo of 4-1-3-0 for each rep. Remember your muscle needs to be under tension for a longer period of time for maximum effect. This is the technique that will help strengthen your muscles and/or give them the definition you want.
3. Your Ego is making the gym an intimidating place
The third point and our biggest pet peeve - those who's egos at the gym effect other gym-goers. This includes slamming/throwing weights, yelling, and swearing. We get it, you lift more than the other guys - but not everyone in the gym cares to interrupt their workout to hear/see you do it. Would you act like this in any other public place? We sure hope not. Remember, everyone at the gym is there because they want to improve their fitness just like you. This kind of behaviour can even deter people from certain areas of the gym (i.e. the squat racks and free weight areas) or the entire gym in general. So save your profanity for somewhere else and try to let everyone enjoy their workouts.
4. When your Ego is important
In the odd scenario, there are certain people who should use their ego under certain circumstances. Similar to confidence, having an appropriate ego can be the difference between having the best workout ever, or having to take a backseat to other people's. This can mean having the ego/confidence to discourage people from hogging machines, rotating in to machines that are in use, or even make friends! Every person pays the same membership price, so should have the same access and enjoyment at the gym. So if a person is spending their 90 second rest time sitting on the machine and not using it, asking to rotate in (politely, obviously) is not only an appropriate way to show your ego, but may also keep theirs in check.
If everyone paired their ego with humility, we'd all have a pretty good lift session.