Physical fitness garments are disclosed. In an embodiment, a garment for being placed in contact with a wearer's limb includes a base layer having a base level resistance to stretching, and an activation element coupled to the base layer, the activation element comprising a lattice pattern and having a resistance to stretching greater than the base level resistance to stretching, wherein said activation element is configured to be placed in contact with the back of the wearer's thigh, not to extend above the upper most extent of the gluteus maximus, and not to extend below the knee, and wherein the garment is configured to be able to cause increased activity in a first muscle in the wearer's limb during a locomotion movement via an increase in the resistance to contraction of the first muscle provided by the garment during locomotion of the wearer.