Resistance Bands - Heavy Duty 41 Your set includes: two 41 loop bands; purple - 1/2 Use bands with or without the accessories for extra versatility, and to accommodate your fitness needs. Combine bands for custom resistance. Incorporate resistance bands into your workouts to increase the versatility of your routines. Add bands to your P90X, strength training, yoga or Pilates routine to for increased difficulty, or to increase flexibility. Access to FREE resistance band exercises. Lifetime Warranty