Sedentary behavior (SED) and physical activity (PA) are distinct behavioral domains that must be considered before interpreting individual profiles, particularly for amateur athletes which are considered active. The aim was to describe the PA and SED of master amateur runners and footballers, the main individual and team sports. Sixteen male runners and 13 footballers (42 ± 6.9 and 43.9 ± 3.9 years) were monitored for 7 days using triaxial accelerometers (30 Hz). The median (interquartile range) of up to 10 min of moderate-to-vigorous PA (MVPA bouts) was similar among runners and footballers [33.3 (56.0) and 32.5 (47.8) min/day, respectively] and achieved the recommended activity level. Vigorous PA levels were achieved, but were higher for runners than footballers [9.8 (59.5) and 1.6 (3.9) min/day, respectively]. Week-day differences for runners and footballers were found for light [202.0 (139.1) and 261.3 (115.3) min/day, P = 0.001], moderate [47.7 (59.8) and 103.3 (82.7) min/day, P < 0.001] and vigorous PA [9.8 (58.9) and 1.7 (3.9) min/day, P < 0.001]. Athletes present alarming time in bouts of 30-min of sedentary activity on weekdays [202.8 (270.9) and 254.0 (224.3) min/day, P = 0.07]. On the weekends, differences were found in moderate [48.3 (54.9) and 60.8 (89.9) min/day, P = 0.013], MVPA bouts [48.2 (71.4) and 11.3 (44.8) min/day, P < 0.001), and vigorous PA [11.6 (62.4) and 1.3 (4.1) min/day, P < 0.001]. The results of the present study highlight the need to consider the excessive amounts of sedentary behavior in master athletes that cannot be masquerade by adequate PA profiles.