Sentence 1: I have been training for my next wrestling match. 
 Sentence 3: I have gained a lot of muscle 
 Sentence 4:  Now I have to move up to a higher weight class 
 Sentence 5:  I am glad I lifted weights and I can be in a different weight class 
 Option 1: I have been lifting a lot of weights to get stronger. 
 Option 2: I have been lifting light weights to be more slim.