Since I can't get to a gym, I have limited access to weights. Im used to working with the 100 - 110 lb dumbbells for bench. All I have are 50s. I'm doing sets of 25 for between 100 and 200 reps, with push-ups up to 200 a day. Is this lowered weight with higher reps going to help me hold onto muscle? I've never had to drastically go down in weight this much, but I'm stuck. Advice?