liftcalc.rb

#!/usr/bin/env ruby

puts "\n** This is a regimen calculator based on the \"Get In Shape\" post on"
puts "** Justin Cunningham's \"Little Bit of Code\" blog post at"
puts "** http://littlebitofcode.com/2010/03/01/get-in-shape **\n\n"

class LiftCalc
  attr_accessor :maxweight

  def initialize
    @maxweight = 0
  end

  def new
  end

  def calculate(checkweight, reps)
    @maxweight = ( checkweight.to_i / ( 1.0278 - ( 0.0278 * reps.to_i )) )
    round_down(@maxweight)
  end

  def round_down(weight, nearest=5)
    (weight/nearest.to_f).round * nearest
  end

  def max_percent(percentage)
    weight = (@maxweight * percentage.to_i) / 100
    round_down(weight)
  end

end

puts "Pick a weight you think you can lift between two and 10 times, but no more."
print "Weight (in pounds): "
checkweight = gets.chomp

puts "\nAwesome. Do some reps of #{checkweight} pounds and tell how many you were able to do."
print "How many did you do: "
reps = gets.chomp

lc = LiftCalc.new
weight = lc.calculate(checkweight, reps)

puts "\nHmmm. The max weight you should safely do is:"
puts "*******************"
puts "*** #{"%.2f" % weight} pounds **"
puts "**** pansy ass ****"

puts "\nNow that's out of the way, here's the regimen I want you to do today."

puts "Try and do this:"
puts "15 reps of #{lc.max_percent(45)} lbs"
puts "7  reps of #{lc.max_percent(60)} lbs"
puts "5  reps of #{lc.max_percent(75)} lbs"
puts "3  reps of #{lc.max_percent(85)} lbs"
puts "2  reps of #{lc.max_percent(90)} lbs"