If you ask any professional player what the single most important skill in an arena battler is, they will all give you the exact same answer.

You are making critical strategic decisions based entirely on blind hope rather than solid mathematical reality.
The Elixir Advantage
If you launch a massive 8-elixir push while the opponent is sitting at 10 elixir, they will easily defend it using perfect counters, often resulting in a negative trade for you.

This situation—having significantly more energy than the opponent—is known as an 'Elixir Advantage', and creating it is the primary goal of the game.
Never overcommit on a push if you don't know their elixir count.If you are up by 4, launch your win condition immediately.If you are DOWN in elixir, play hyper-defensively. How to Train the Skill
Start by simply categorizing the opponent into three states: 'High Elixir' (7-10), 'Medium Elixir' (4-6), and 'Low Elixir' (0-3).

As you get comfortable with this broad tracking, start actually doing the math: "They started at 10, played a Golem (8), so they are at 2, plus two seconds of generation, they are at 3."
The Match StageElixir SpeedTracking DifficultySingle Elixir (First 2 Minutes)1 Elixir every 2. When you have almost any questions about where and how to employ tower rush, you are able to email us on the site. 8 secondsEasy to Moderate; plenty of time to calculate trades and track generation in your headDouble Elixir (Final Minute)1 Elixir every 1.4 secondsExtremely Difficult; the math changes so fast you must rely on instinct and 'feel' rather than raw numbers The True Metric of Winning
Tower health is a deceptive metric; you can have full tower health and still be losing the game if you are down 5 elixir.

When you perfectly predict an opponent's inability to defend your push based purely on your mental calculation, you will feel invincible.