Training Methodology
Concurrent Training
Concurrent training is the simultaneous development of strength and aerobic endurance within the same training program. For team sport coaches, this is not a theoretical concept. It is the daily reality. Every athlete in a team program is doing both, and the question is how to structure it so they do not undermine each other.
The interference effect
Research going back to the 1980s established that combining high-volume endurance training with heavy strength training can blunt strength and hypertrophy adaptations, called the interference effect. The mechanism is partly physiological (competing molecular signaling pathways) and partly practical (accumulated fatigue limiting effort in strength sessions). It is real, but it is also context-dependent. Athletes doing moderate conditioning alongside strength training see far less interference than those doing high-volume endurance work.
How coaches manage it
Sequencing matters. When both qualities must be trained in the same session, strength work before conditioning generally preserves more strength adaptation than the reverse. Separating them by several hours, or by day, reduces interference further. The key variables are conditioning volume, intensity, and mode. High-intensity interval work and sprint training interfere less with strength than prolonged aerobic work at moderate intensity. Most experienced S&C coaches manage concurrent training more by feel and observation than by strict formula: if athletes are consistently underpowered in their lifts and their conditioning load has been high, that is the signal.
Related terms
Periodization · Block Periodization · Load Management · GPP (General Physical Preparedness)