This is sub-optimal. The glutes are slow twitch dominant by a few percent, but the hamstrings are composed of a whopping 70% fast twitch fibers. The erector spinae are slow twitch dominant by around 6%. This means you should use low reps for the hamstrings, but medium to high reps for the lower back and the glutes.
1 To melt your beads, you should preheat your oven to 400Â°. When it's finished preheating, bake the Perler beads for 10 minutes. After that, remove your beads, allow time for the beads, pan, and cookie cutters to cool.  Once cool, you can pop your Perler beads free of your cookie cutters.
Preheat oven to 350 degrees F (175 degrees C). Place chicken in a roasting pan, and season generously inside and out with salt and pepper. Sprinkle inside and out with onion powder. Place 3 tablespoons margarine in the chicken cavity. Arrange dollops of the remaining margarine around the chicken's exterior. Cut the celery into 3 or 4 pieces, and place in the chicken cavity. Bake uncovered 1 hour and 15 minutes in the preheated oven, to a minimum internal temperature of 180 degrees F (82 degrees C). Remove from heat, and baste with melted margarine and drippings. Cover with aluminum foil, and allow to rest about 30 minutes before serving.