The study aims to compare differences in muscle activation during push-ups performed at five body angles using different suspension methods. The investigators will recruit 20 healthy men with resistance-training experience. Each participant will perform push-ups under three suspension conditions (no suspension, hands suspended, and feet suspended) at +30°, +15°, 0°, -15°, and -30°. For each angle, participants will complete five repetitions with 3-5 minutes of rest between angles; at least 48 hours will separate suspension conditions. Surface electromyography (EMG) will record activity of the pectoralis major, anterior deltoid, triceps brachii, upper trapezius, and serratus anterior. EMG amplitudes will be normalized to maximal voluntary isometric contraction (%MVIC). Data will be analyzed using a repeated-measures two-way ANOVA to test the effects of suspension type and angle on muscle activation. The a priori hypothesis is that feet-suspended push-ups will elicit greater activation than other conditions, and that lower body angles will be associated with higher activation levels.

Inclusion Criteria:

• Healthy male adults with ≥3 months of regular resistance-training experience.
• Able to independently perform a standard push-up with proper form.
• Willing to follow pre-session restrictions (e.g., avoid strenuous exercise within 24 h) and provide written informed consent.

Exclusion Criteria:

• Physician-diagnosed cardiovascular disease, musculoskeletal disorders, chronic pulmonary disease, or arthritis.
• Major surgery or severe injury within the past 12 months that affects physical activity.
• Current pain, injury, or functional limitation of the upper or lower limbs or trunk that would interfere with push-up performance.
• Any medical condition judged by the investigators to make participation unsafe.

Healthy male adults with at least 3 months of regular resistance-training experience, capable of independently performing a standard push-up with proper form. Participants will be recruited from university sports facilities and local fitness centers through flyers, online announcements, and word of mouth.