Weights

weights.rb

# Given a weight, break down into buildup to work weight
# 45, 50, 65, 70, 75-80, 90, 100
#
# weight sizes: 2.5, 5, 10, 15, 25, 35, 45
# bar weight: 45
#
# example: final weight 155
#
# 45%: 69.75 - 45 = 24.75 / 2 = 12.375. we can choose 15 (for 75lbs or 48%), or 10 + 2.5 for something close but more weights
# TODO: choose less weights
PLATES = [2.5, 5, 10, 15, 25, 35, 45]
BAR_WEIGHT = 45
def weight_warmup(final)
  [45, 50, 65, 70, 75, 80, 85, 90, 100].map do |pct|
    target = final * (pct / 100.0)
    side_target = (target - BAR_WEIGHT) / 2
    plates = []
    while plates.sum < side_target
      sort = PLATES.map{|p| [p, (side_target - plates.sum) - p]}.sort_by{|p, m| m.abs}
      plates << sort.first.first
    end
    weight = plates.sum * 2 + 45
    [pct, plates, weight, ((weight / final.to_f) * 100).round]
  end
end

def print_weights(weights)
  weights.map { |pct, plates, weight, real_pct| "#{pct}%: #{plates.join(", ")} (#{weight}lbs/#{real_pct}%)" }
end

# I'm moving from 155 -> +10%
weights = weight_warmup(155 * 1.1)
weights_a = print_weights(weights)
puts weights_a

# 45%: 15, 2.5 (80.0lbs/47%)
# 50%: 25 (95lbs/56%)
# 65%: 35 (115lbs/67%)
# 70%: 35, 2.5 (120.0lbs/70%)
# 75%: 45 (135lbs/79%)
# 80%: 45, 2.5 (140.0lbs/82%)
# 90%: 45, 10 (155lbs/91%)
# 100%: 45, 15, 2.5, 2.5 (175.0lbs/103%)