**DESCRIPTION:** This will be a two-part study in which participants will 1) complete a series of self-report measures, cognitive tests, and provide judgments of the personalities of people whom they observed in a recorded interaction, and 2) complete a physical test of cardiovascular fitness. It is hypothesized that 1) physical fitness will be related to cognitive functioning and psychological well-being; 2) cognitive functioning and psychological well-being will be related to personality judgment accuracy; and that 3) cognitive functioning and psychological well-being will mediate the relationship between physical fitness and personality judgment accuracy. **METHOD:** *Participants:* Participants will include 200 individuals between the ages of 18-25. Most individuals will be psychology undergraduates from a local institution, but student-status is not a requirement for participation. Participants must be free of injury, disability, or disease, and must not be pregnant or have a psychological or medical disorder. *Measures:* Cognitive functioning will be measured with a half-version of the Ravens Advanced Progressive Matrices (APM; 18-items; Raven, 1938) a 3-item memory test for each target observed, developed for the purposes of this study; the Attributional Complexity Questionnaire (ACQ; 28-items; Fletcher, Daniovics, Fernandez, Peterson, & Reeder, 1986); and a 22-item version of the dispositional intelligence measure developed by Chiristiansen and colleagues (2005). Psychological well-being will be measured with the 84-item Psychological Well-Being Scale (PWBS; Ryff, 1989); the 5-item Satisfaction with Life Scale (SWLS; Diener et al., 1985); the 20-item Positive and Negative Affect Schedule (PANAS; Watson, Clark, & Tellegen, 1988), the 16-item Wong and Law Emotional Intelligence Scale (WLEIS; Law, Wong, & Song, 2004), and the 12-item Multidimensional Scale of Perceived Social Support (MSPSS; Zimet, Dahlem, Zimet, & Farley, 1988). Personality judgment accuracy will be measured by having participants watch six videos of individuals describing themselves in some way, and then filling out other-report versions of either the Big Five Inventory (BFI; John, Donahue, & Kentle, 1991), or the 60-item International Personality Item Pool version of the NEO-PI-R (IPIP-NEO; Goldberg, 1999). The accuracy criteria for each target will be an average of self-reports and two other-report assessments from individuals who had known the target for at least 6-months. Physical fitness will be measured using the 7-item International Physical Activity Questionnaire Short Form (Craig et al., 2003), as well as the Astrand Rhyming Cycle Ergometer Test. Other measures include the 33-item Marlowe-Crowne Social Desirability Scale (MCSDS; Crowne & Marlowe, 1960), a demographics form, a self-report version of the BFI, and a medical history form. These measures do not have hypotheses attached to them for the current study. *Procedures:* Up to four participants will be able to participate in the first part of the study at the same time and place. A trained research assistant will be present throughout the study to provide directions and answer questions. The room will be kept quiet with the door closed to reduce distraction and provide some privacy throughout the study. Upon arrival, participants will be greeted by a research assistant. Participants will be seated at a desk with a laptop, computer mouse, and headphones, and will be given spoken directions from the research assistant. These directions will be read verbatim from a script to keep the experience consistent for all participants. All measures and consent forms (except for the Medical History Form) will be completed using a laptop computer.  At the beginning of the study, participants will view and sign a combined consent form for both Sessions I and II. After completion of the consent form, participants will have 15 minutes to complete the APM. Next, participants will watch six videos of target individuals, each three-minutes in length, using the provided laptop and headphones. Upon completion of each video, participants will complete an other-report version of the BFI or IPIP-NEO to rate each target’s personality. Participants will also complete a brief 3-question memory test for each video based on information from the video they just observed. Next, participants will complete the ACQ, the measure of dispositional intelligence, the PWBS, SWLS, PANAS, WLEIS, and MSPSS. The final self-reports will include the MCSDS, IPAQ-SF, a self-report version of the BFI, a basic demographics questionnaire, and a paper-version of the medical history form. The first part of the study is expected to take between 90 and 120 minutes.  After completion of the first session, participants will be granted class credit (if applicable). The questions on the Medical History Form assess the following categories: symptoms/risk factors/diagnosed disease, orthopedic injury, psychological disorder, and pregnancy.  Presence of pregnancy is an immediate exclusion factor, as well as presence of a current injury to the back, arms, legs, or joints, or a reported psychological disorder. Cardiovascular risk is divided into three categories: low risk, moderate risk, and high risk, and the majority of the questions assess this particular aspect.  Participants classified as "low" or "moderate" risk will not be excluded from the study and are considered safe to participate in a submaximal test of fitness without a prior medical screening according to ACSM guidelines. Participants who are classified as "high" risk will be excluded from participation.  In the second part of the study, participants will complete the ARCET. The goal is to have participants complete this session within 2 weeks of the first session. They will be asked to not eat or drink for at least 2 hours prior to testing. Participants will be run individually using one set of equipment to keep measurements consistent. The primary investigator will be present to set up for and monitor the heart rate and blood pressure of each participant, and will  be joined by a research assistant. Research assistants will be trained in the protocol of the test, and will be supervised by the primary investigator at all times. The protocol and procedure of the test will follow what was outlined by Astrand and Rhyming (1954). Participants will have the opportunity to re-review and re-sign the informed consent document for the ARCET before continuing with the test.  If the participant appears physically ill, he/she will not be allowed to start the assessment and will be rescheduled.  Weight (kg) and height (cm) will be recorded with shoes on.  Participants previously reported activity level from the Medical History Form will be used to determine a starting baseline for cycle resistance for pedaling. A heart rate monitor (pulseox) will be worn on the finger for the duration of the test, as well as a blood pressure cuff around the left arm. A cycle ergometer will be used for each participant. Seat height will be adjusted accordingly, to obtain a 15-20° knee flection at maximum extension of the cycle rotation. Resting heart rate and blood pressure will be recorded before the test, and will be continuously monitored and recorded throughout the test. Participants will first engage in a warm-up of pedaling for 3-4 minutes (timed with a stopwatch), with no resistance, at 50 rpm. Upon completion of the warmup, the test will begin. At the beginning of the 6-minute test, resistance will be increased based on sex and fitness level (1 or 2 kg for unconditioned men; 2 or 3 kg for conditioned men; 1 or 1.5 kg for unconditioned women; and 1.5 or 2 kg for conditioned women). Participants will pedal at 50 rpm for the duration of the test. Heart rate will be recorded every minute, and blood pressure will be obtained during the last 30-seconds of every two-minute period. If at any point a participant reaches his/her maximum heart rate (220 – age), or if blood pressure exceeds a healthy range for exercise, the test will be terminated. The test will also be terminated if a participant's heart rate exceeds 170 beats/minute for at least one minute. If the participant reaches a heart rate between 125 – 170 beats/minute within the fifth and sixth minutes of testing, the test concludes. If the participant does not reach this target range within both the fifth and sixth minutes of work, the test will continue with resistance being increased by 0.5 kg each minute until the last two heart rates fall within the desired range. Upon completion of the test, participants will have a cool down period with no resistance until heart rate and blood pressure have been reduced. At the end of the session, participants will once again be granted class credit, as well as entered into drawings for one of five $20 Amazon gift cards. In order to be entered into the drawings, participants will fill out a paper contact information form which includes a name, email address, and phone number that will not be connected to their data in any way. Participants will also be sent their results for the ARCET through email after completion. The second session is expected to take no more than 30 minutes. **ANALYSES:** *Hypothesis 1*: The first hypothesis will be assessed through multiple regression analyses. Physical fitness (either self-reported or objective) will act as the criterion in each model, with either a composite of psychological well-being or cognitive functioning acting as the predictor. In addition, multiple regression analyses will be run to examine the roles of each individual measure of psychological well-being and cognitive functioning in relation to physical fitness. This hypothesis will also be analyzed through one-way ANOVAs and repeated measures ANOVAs. For these analyses, physical fitness (either perceived or objective) will be divided into three groups based on the American College of Sport Medicine criteria, and cognitive functioning and psychological well-being will be compared across these groups. The basic ANOVAs will examine the composite score of either cognitive functioning or psychological well-being, while the repeated measures ANOVAs will examine each separate component of these constructs. The reason for examining this hypothesis in this additional format is to be consistent with other literature in exercise science. *Hypothesis 2:* To assess Hypothesis 2, composite scores for psychological well-being and cognitive functioning will be entered as moderators in the Social Accuracy Model (Biesanz, 2010). A separate analysis will be run for each moderator, and both distinctive and normative accuracy will be examined. The goal of these analyses is to assess how each of these variables moderate accuracy levels. This method is used with similar hypotheses in the personality accuracy judgment literature. *Hypothesis 3:* For this hypothesis, distinctive and normative accuracy scores will be calculated with SAM. Mediators will be looked at through a Bootstrapping analysis. The generated datasets will also determine 95% CIs. Analyses will include physical fitness (self-reported or objective) as the predictor, cognitive functioning or psychological well-being as the mediator, and personality judgment accuracy (distinctive or normative) as the criterion.