Here are links to individual training activities that players can undertake:

Technical Sessions
Ball Skills 1 with Coach Nick
Ball Skills 2 with Coach Victoria
Ball Skills 3 with Coach Nick
Ball Skills 4 with Coach Victoria
Ball Skills 5 with Coach Nick
21 MLS Academy Skills Sessions on You Tube
YouTube GK Session

Celtic FC Training Activities
 Individual Sessions 1-36
Individual Sessions 37-40
Goalkeeper Sessions
Sessions by Topic - includes diagrams, instructions, and added GK sessions, along  with the famous Celtic Turns

Celtic FC Home School Activities
Brain Teasers (requires some Internet research)
Literacy/Writing
Numeracy

Physical Training
White Oaks Performance Center Exercises