Fitness goals are set so that you can reach those levels of fitness in your own time without wasting the time of everybody else at training. That enables the training sessions to be focussed maximally on skills / use of the football, etc.

5k in 20 minutes: this is not a very demanding level of fitness. Some players can reach that level easily but all players are capable of running that time. If you are slower than 20 minutes then you unquestionably need to do extra work.

60 push-ups: Push-ups represent one of the simplest exercises that is able to strengthen the shoulder muscles and particularly the triceps.

"Brick-curls": In an ideal world everybody would have weights that they could use in their own personal gymnasium. Bricks of different weights are a part of a poor man's gymnasium. Brick curls are designed to provide an opportunity for players to develop quantifiable strength of chest and shoulder muscles in their own homes.