Today's the Hard medley swimming menu

Well, I consider an order today’s hard medley swimming lesson menu from morning. Today’s main order is Free mainly thus I’ll make them swum a medley pattern for pre-main order.

Up) 200m, Free 50m × 4t

       200m, Flutter kick (On Board) 100m × 2t
Pre)  450m, (1'10) Medley jog
   1) 50m(Fly),  50m(Ba),  50m(Br)
   2) 50m(Ba),   50m(Br),  50m(Fly)
   3) 50m(Br),   50m(Fly), 50m(Ba)
Easy)  50m, Loosen Free 50m × 1t
Main) 1,500m, Free 100m × 15t
Down) 100m, Free 100m × 1t

This order total distance is a 2,500m in 50minutes. How do you think my today’s the hard medley menu?
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