Sentence 1: I joined my friend in the gym to lift weights. 
 Sentence 3: I lifted half of what my friend did, and I almost dropped the weight 
 Sentence 4:  When we moved to the leg exercises, I quit from exhaustion 
 Sentence 5:  I went into the locker room and packed up my bag for home 
 Option 1: We started our workout on the bench press. 
 Option 2: We started our workout on the treadmill.