Here are some PE / relaxation links that might be useful / fun:
Cosmic kids yoga - great for the younger children -
https://www.youtube.com/user/CosmicKidsYoga
'Peace Out' guided relaxation for kids - numerous videos -
https://www.youtube.com/playlist?list=PL8snGkhBF7njO0QvtE97AJFL3xZYQSGh5
Kids workout - 25 mins
https://www.youtube.com/watch?v=dhCM0C6GnrY&t=636s
Kidzbop dance along (lots of dance along vids to well-known songs)
https://www.youtube.com/results?sp=mAEB&search_query=kids2+bop
Zumba with Dovydaj - zumba for kids videos-
https://www.youtube.com/channel/UCOjZigyo_fg2V7JdGwePSwg
Yoga for the classroom - 10 min vid -
https://www.youtube.com/watch?v=Td6zFtZPkJ4
The Learning Station - contains numerous 'brain break' songs
https://www.youtube.com/channel/UC4Hdb26_xnPQsntwLazMqYw
Guided meditation for children -
https://www.youtube.com/watch?v=DWOHcGF1Tmc
Kids' workout -
https://www.youtube.com/watch?v=L_A_HjHZxfI