history: I just hired four new people to work for me. Two all ready quit because the job was just to hard for them. Hired 4 more people to join my crew at work last week. 2 all ready quit. I'm bummed.  Dang_comma_ that really stinks. Why did they quit so quickly?
current: The  work was to physically hard for them. But I still had big hopes for them. 
next: Perhaps you should screen new employees better? Like give them a physical performance test?