Shaikh Al-Albani rahimahullah said:

“The Muslim Brotherhood abandoned the path of the youth of Muhammad sallahu alayhi wa salam by a far, far distance. Their religion is sports, soccer, basketball, and I do not know that there are other ball games. I wish that this was by way of holding fast to the Sunnah and strengthening the body because the Prophet sallahu alayhi wa salam said:

لمؤمن القوي أحب إلى الله من المؤمن الضعيف وفي كل خير

A strong believer is better and is more lovable to Allah than a weak believer, 

[Saheeh Muslim no. 2664]

First, it is not from the Islamic etiquette for the Muslim to imitate the disbeliever… it is not from the Islamic etiquette for him to expose his thigh…”
[Taken from Silsilatul-Huda wal-Noor no. 200 found here: ]

The Shaikh continues to talk about how this is blind following of the disbelievers and wrong.

Translated by

Faisal Ibn Abdul Qaadir Ibn Hassan
Abu Sulaymaan