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When a team is accused of spying on another team in training to gain an advantage in an upcoming fixture. It riles up managers, first-team coaches, players, and adds tension to the next meeting between the two. Fans of the team accused of spying use it as an excuse to dress up as birdwatchers with binoculars, and the fans of the team spied on can get very angry. It adds an extra element of rivalry and tension.

The aim of SCR is to provide a more competitive playing field for all Premier League clubs. In theory it should prevent clubs with the richest owners from hoarding too many players, without compromising clubs who want to invest in stadium and training infrastructure amongst other organisational improvements. There is also a multi-year rolling allowance of 30% above the 85% limit. Clubs must submit estimated revenues and costs to the Premier League at the start of the season, with compliance assessed in March based on those figures. Spending must be at a maximum of 85%, with a six-point deduction for clubs that go over that threshold and a further point deducted for £6.5 million spent over the 115%.

How good the backup players are when starters get injured or rested. Deep squads can rotate without losing quality. Shallow squads fall apart when key players are missing. Manchester City's depth means their B-team could challenge for titles; smaller clubs rely on 11 players and pray they stay fit. Modern football's congested schedule makes depth more valuable than ever.

The foot that stays planted while you kick with the other. Where you place your standing foot affects the direction and power of your shot or pass. Too far from the ball and you lean back, skying it. Too close and you can't get a clean swing. Coaches drill standing foot placement into youth players because it's the foundation of good technique.

Moving your foot over and around the ball without touching it, creating a feint to throw defenders off. Also called scissors or "pedaladas." You can do one or string several together, like early Ronaldo at United, who would do four or five in a row. At speed with a sharp burst afterwards, it leaves defenders stuck. Do too many and your teammates start getting annoyed.