Is it just me or do you work different muscles when you stand to pedal vs sitting to pedal? Standing to pedal exhausts me quicker it seems and I want to sit back on the saddle to pedal cause i get tired of standing. I am not talking of 2-3 minutes of standing either. I mean if I stand and mash hard for 30 seconds my legs get exhausted and I want to sit and pedal for a bit. For the record I know I need to get in better shape. 
I also think I would rather climb short bursts than longer shallower grades. The longer grades are more tiresome than the shorter steeper ones.
I also think I would rather climb short bursts than longer shallower grades. The longer grades are more tiresome than the shorter steeper ones.