Electromyographic muscle activity in curl-up exercises with different positions of upper and lower extremities.
Rutkowska-Kucharska
Alicja
A
Biomechanical Analysis Laboratory, Department of Biomechanics, University School of Physical Education, Wroclaw, Poland. alicja.rutkowskakucharska@awf.wroc.pl
Szpala
Agnieszka
A