North Melbourne's youngest players returned on Tuesday to begin their 2013 preparations in sweltering heat.

Split into two groups, they alternated between the gym and Princes Park with the Aegis Park oval off limits due to the redevelopment.

Check out some of the best pictures from the day below.

Jack Ziebell hits the gloves hard
Jordie Gysberts marks strongly
Jack Ziebell pumps iron
Tom Curran works on his upper body
Majak Daw gets straight back into the swing of things
Players try to maintain their balance
Gysberts gets settled in with his teammates