We actually will need a little bit more of both to finish the job . In some places the old plastic cement had pulled away from around the sky light and I could put my fingers right down behind it . I only cut my little finger a little bit , pounded my left thumb which still hurts and is black and blue under half the nail and Sleepy hurt his knee and ankle , but other than that we just have sore muscles . I left home about noon and we did n't get back until a little after six this evening . Sally was just coming from church so we met at SubWay for supper .
According to the above context, answer the following question.
What may be the reason for hurting themselves so much ?


They are not used to construction .