Device and methods for tuning a skeletal muscle

A device comprising a foot securing means, a support member operably attached to said securing means;

• an outsole;
• an anterior protuberance and a posterior protuberance;
• said posterior protuberance, said anterior protuberance, or both said anterior protuberance and said posterior protuberance, are prepositioned and fixed to a position distanced from a balanced position, said distanced is selected from the group consisting of:
• (a) 1 mm to 10 mm laterally, (b) 1 mm to 10 mm anteriorly, (c) 1 mm to 10 mm medially, (d) 1 mm to 10 mm posteriorly, (e) 1 mm to 10 mm anteriorly and medially, (f) 1 mm to 10 mm anteriorly and laterally, (g) 1 mm to 10 mm posteriorly and medially, or (h) 1 mm to 10 mm posteriorly and laterally, said balanced position comprises a position:
• wherein said device is adapted to exert a reduced inversion or a reduced eversion during stance phases to a user's foot, wherein anterior protuberance's peak and posterior protuberance's peak are positioned on opposite sides of a centerline of said support member.